The argument you just gave is exactly the one I had in mind when I said don't bother arguing. Not that my arguments are ironclad, but you won't convince me that 2 space finger rollers don't have an unfair advantage.
There are no space bars as sensitive/controllable as two separate buttons. With a single space bar, sure you can get a few fast taps, but it's 100 times harder to control than if you're using two buttons.
Part of that is because with 1 spacebar, the downstroke of one finger can prevent the spacebar from lifting from your previous space press if your timing is off. That doesn't happen with 2 buttons because the buttons aren't physically connected. This limitation also affects your timing.
The proof that 2 space "finger rolling" gives an unfair advantage is in the results. Just compare a "finger roller" with a 1 space roper - you don't have to know who is who because it's immediately obvious. Arguing about how WA accepts keyboard inputs and about ideal sensitive spaces, etc, is irrelevant. In theory maybe it works the same, but in practice two-space "finger rollers" have a huge advantage.
You said you doubted if FRing helps. Having the ability to do fast, reliable tapping definitely gives you an advantage in some situations. If you're doing a scroll close to the roof with 1 space bar, for example, you pretty much have to slow down or stop if you get too close to the roof with too much speed, because you can't trust that the spacebar will register, and you'll end up hitting your head on the roof. "Finger rollers" just spam some taps and keep scrolling. I remember watching this exact scenario with barman rr'ing with his last worm in a clanner, where his worm suddenly got really close to the ceiling during a fast scroll, but instead of slowing down he pulled a bunch of impossible taps out of his ass to save his scroll, without losing horizontal speed, with his worm practically touching the roof. That same move would be pretty much impossible, and at least far too risky to attempt, with one space bar. And it would be a lot more difficult to time properly with the above-mentioned limitation of having a single spacebar that is physically one piece. I'm not saying barman isn't a great roper, but when you watch something like that, you are forced to think "wow, he has an unfair advantage".
In the video I posted, the guy can tap pretty fast, but he still can't trust his space bar enough to scroll with a short rope. Using two spacebars eliminates that uncertainty.
On a side note, there are some remappers that will accept both inputs, even if the two spaces are pressed at the same time, and input one space right after the other. But you're not talking about those programs.
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