I fail to understand how the physics have more 'depth' in W:A vs. any of the other new titles. I think that what you mean is that you are more able to accurately predict shots based upon your knowledge of W:A vs. the other games.
That is exactly part of what gives WA more depth, the fact you can predict most things, added along with all the enhancements DC/CS brought us, nothing will ever top WA unless they take our advice.
I guess what you are referring to as 'depth' is still nebulous. To me, the physics in W:A is a bit cartoon-like on the whole, especially when it comes to the ability to make insane boomerang shots with LG + zook in hysteria, or the utterly simplistic way that grenades bounce. In W:A, nades will bounce and bounce and bounce, whereas in the newer 2.5D games, they will only bounce when it makes sense that they should, otherwise they will eventually fall, roll, and come to a stop.
I wouldn't say grenades are simplistic, only a few players truly mastered BnG(without notching, so barman/Mablak/Random etc don't count), and it took years to achieve that level of creativity & consistency.
When I am talking about depth, refer to the 1st part of this post, in terms of simplicity, it's all the same really, WA has more depth because of everything that is possible, it wasn't even Team17 that made WA as good as it is, it was fan-based programmers, who IMO done a way better job than Team17 ever could/will, because they understood the game and what the players want.
The reason why the newer games get boring is because of poor choices made by Team17 in terms of stuff we've mentioned before, like UI, lack of customization, lack of global chat, poor performance on older machines, lack of gameplay features to make worming more enjoyable in general (like stuff that was patched into W:A), etc. Any of the new games could be much, much better if Team17 merely patched them... and if they actually took the time to make them cross-play compatible, they'd be very active. (And fun!)
Agreed, but that's just part of the reason.
Edit:
Nice hair Jonno
Sh*t phone me an ambulance i'm having a heart attack!!!