Quote"while the other is more than that, and requires physical access to and contact with a part of hardware that might not actually be physically accessible in an environment such as a live LAN tournament or other event"
I fail to see how you would not have physical access to the monitor sitting directly in front of you, I have watched a fair number of professional gaming events live and yet to see one where the monitor is not within arms reach.
The only valid reason I can possibly think to prohibit using your fingers as visual aids is to prevent the screen from getting marked, however this can be countered as long as the screen is maintained and cleaned properly.
What I do, and what they do, no matter how you approach it, in basic form is described as using visual cues/aids.
They are using the same basic peripherals, what they see on the screen and using their body to get the right aim.
I am using the same basic peripherals, what I see on the screen and my body to get the right aim.
The point I am making is that you are using your own body and nothing but your own body and any connected peripherals to play the game, it is 100% natural, I have seen people make a living on Twitch from doing speedruns using Dance Dance Revolution pads, saw people literally playing games using their feet to control the gamepads(heck even Anubis experimented with this in roping lol), and while some people find that ridiculous, I do not, so to answer your question, I do not think that it would look ridiculous enough that live events would want to keep spectators from having to endure watching it, as long as they are using the same equipment, it is fair in my opinion.
I also do not think taking the opinions of some people that they personally think something looks ridiculous should be used as good judgement for making rules, so long as you are not hurting anyone directly.
Also, I would like to see anybody play without "physical access" and "contact" with their monitor, our eyes are physical and make eye contact with the screens, our brains are physical too, and they relay information and actions throughout our body.
That might come across as annoying, or frustrating, or even condescending but in all honesty I like to be specific(and realize people hate me for it), and yet we still discuss these things based on opinions as there is no law for it, and my opinion is that I do not see an unfair difference in using the full extent of your physical body while playing a video game, it is the actions inside the game that matter.
I also acknowledge, and always have, that with that statement people could say:
"But isn't notching using the full extent of your physical body as well?"
The answer is yes, as depending on your belief, math is universal and exists as a natural state that exists before mankind did, however my problem with that is specifically counting and using math to achieve 100% angle accuracy without fail, and when it comes down to it, that is because in my opinion it is boring and ruins the fun.
Does that sound selfish to you? It sounds selfish to me, but that is how all man-made rules and laws are created through belief, opinion and/or agreement, which is a massive discussion alone, but let us not go there.
There are many examples we could discuss where using the full extent of your body is allowed, but you must resist the temptation to do specific things inside the game itself because they are rules.
I also did notice your careful selection of words here:
Quote"While I don't personally think thumbing is a form of cheating anywhere near comparable to using physical rulers and such"
Which does not rule out the possibility that you still personally think it is cheating, it could come across as you suggesting it is still cheating, just not as much as using physical rulers and such.
Personally I don't believe in distinguishing between minor cheating and major cheating, cheating is cheating, if you break the rules you break the rules.
As for the entirety of your 2nd paragraph, I did not read anything that convinces me adding Anti-Lock to BnG with the already existing rules is a good decision, and I already explained why.
Now I want to elaborate a bit on my opinion between using your hand as a visual aid and notching.
One of the differences between using your hand as a visual aid and using notching/math/charts/rulers etc to play BnG, in my opinion, is that you learn everything on your own, everything you do, even adjustments are still a guess as opposed to already knowing if it is the right angle because you used math and the fact the aim moves exact distances with each notch.
If you knew everything that is going to happen in your life, do you think you would find it as fun?
Granted I did learn 3s grenades 4s full power grenades and some low wind bazookas from M3ntal when I 1st started but then had to re-learn doing absolutely everything again without using math and moving notch by notch and counting to myself.
Let us discuss the re-aim rule as well since Senator mentioned it.
Why was it added in the 1st place? Was it not to stop players repeating the same shot over and over? Other than that and phrases similar to, "It looks better", I have never been told any other reason.
Is this not why we have the no repeat shots rule, in order to force a variation of shots after successful hits rendering this rule almost entirely obsolete, which is influenced based on the factors of the repeat rule you are using.
So, I now find myself asking, why do we even need the re-aim rule? Should we just get rid of it?
StepS - Yes, we have circular aiming, but you did not say that the 1st time.
I also discussed this with M3ntal yesterday about changes to the game engine which would give us real-time aiming instead of it being limited to what it is, so your aim would change for the time the aim button was pressed, it would also make it possible to now aim inbetween the current notches available making BnG even more accurate! I would be ridiculously happy if this was implemented, once and for all get rid of notching and in turn giving a real possibility of reviving the scheme in ways never before thought possible

Either way, I think the hardest challenge in BnG is the fact that so many people have different opinions, at the end of the day we do not have any official professional way of deciding rules for schemes, we don't have a legitimate and trustworthy board of people who can represent the best interests of the entire community.
This issue alone, has the power to destroy friendships, I for one will never forget the pain and depression felt for years due to the issues this has caused, it has created hatred amongst people and countless arguements over the years, no wonder it's becoming an extinct scheme, nobody wants that negativity anymore.