The VVV review, for reference. He talks about the physics and track contour differences from about 7:00 to 15:00. Never heard of him, but he’s detailed in his comparison with GTS.
VVV has been around for a long time. I trust him. But I’m about a day or so I’ll be able to see for myself .
Worthy to note though that physics calculations are not that computationally expensive per se, but also that they can be partly done on the GPU if necessary.
Not GT7 but getting all the circuit challenges gold has been sort of my send off to GT Sport, look forward to doing the same with GT7.