I have used CSA ever since buying GT sport. I just like the way it feels and I feel like I am more connected to what the car is doing for some reason. I seems to give me the feeling and car control from back in the GT5 & GT6 days.
With CSA on, the force feedback on the G29 feels more solid and I have more control of the car rather than with it turned off. It may be a few tenths slower over a single lap but i'm fine with that for the added consistency I get.
I have noticed with CSA turned on in the tyre wear and fuel consumption races that the front tyres take an absolute beating as opposed to people that run with it off. This is purely from just looking at replays of my races.
However I suppose it all depends what works for you, CSA seems to work for me so will continue to use it.
That makes sense. You get a bit understeer with CSA and you push the front tires, more tire wear.
Also when you hit your brake points properly less room for errors with undesteer car.