I whined about the RWD physics in the physics thread, but since then I've become used to avoiding death in GT7, and mostly drive with no aids except ABS Default.
That said, in extremely powerful cars like the C6 ZR1 and/ or driving in the wet, I do need TCS1 to not crawl out of corners like a tortoise. Doesn't mean I could throw the car into the corner or mash the gas out of it, it just helps to rein in the car a little and makes them tolerable.
...when drifting, I swap back to my DS5 and have CSA strong, because F the drift physics.