This thread is turning into "another which sim is best" rabbit hole but I just wanted to respond to this. I did some searching, and iRacing and ACC both have chassis flex. iracing has physics generated ffb and (I think) ACC does. I assume all sims have 100% accurate newtonian physics (that shouldn't be too hard I hope). And all sims obviously have aerodynamics simulated. Some of these things might be a bit more well done than others, but at least they all have them. Acc has pretty advanced tire model but still imperial and not physical (NOT saying that that is worse, just "less dynamic" within the context of this conversation). Iracing has physical tire model. So iRacing and rF2 do indeed have similar levels of "dynamicism" with ACC slightly behind. Not making judgments on the implementation of such things and the intagibles, but as far as ticking physics boxes of this feature and that, iRacing and rF2 are on par with each other unless I'm missing something. Assuming there is not mistakes in the "basic" stuff, it really comes down to to hardest thing to simulate, how one kind of surface interacts with another kind of surface, i.e tire model.