Don't look at a lower DR letter to be a negative thing. It would be matching you with like-minded people who race with those exact same assist. It would also even the playing field more than the current system as the DR in Sport Mode race's is all over the Spectrum now.
The fastest way around the track in GT is with no assist its always been that way and still is in Sport for those who are talented enough to achieve that goal.
Why would you want to race against them knowing you don't stand a chance against them using assist.
Having DR tied into what assist you use would definitely make the race your in more competitive I would think by eliminating the faster guys from them and giving others a better chance of winning against others their own level.
I race with ABS always have always will and I use TC depending on the power of the car and tires I'm required to run. So for me to be in a race with everyone else doing the same thing would be much more competitive than always getting put in with S and A driver's as I do now.
I think it would be better than the current system as it kills two birds with one stone.
However nothing is perfect and would need some adjustments to work. It's just an idea I had that's never going to happen anyway.
There's a lot of issues with the FIA championship and that's why it's still called "Test championship" I would think.
There's SR jumping all over the place - players being really dirty especially on S because they "think" it'll take a long time for it to lower to A/B, and then that inevitably makes your SR down considering how badly the penalty system is implemented and whom it affects.
Then there's the penalty system itself - it should be either like in reality - pit stop run through or stop and go for x seconds, or you should keep your penalty to the end and then it substracts from your time - you can literally not stop or slow down AT ALL for even a 5 second penalty and in 3-4-5 laps of a race it's gone.
But that's a different discussion.
We're here talking about CSA - an unrealistic mod which gives you an advantage. I consider this should NOT be allowed in FIA championship races.
your not kidding
these look like driver aids to me

seems a bit unfair to us DS4 players just looking for an equal playing field /s
Nope, they're not aides. They make a mediocre pedal feel more "real". If you have more money you can get something like a CSL elite which has more weight in the shifter/pedals - like in real life. Your feet do get a bit painful after 7-8 laps, but it feels better.
As far as "leve playing field" - I agree. I think the game should match players depending on what they use. People using wheels with other people using wheels and the same for controller users. That would be fair.
your not kidding
these look like driver aids to me

seems a bit unfair to us DS4 players just looking for an equal playing field /s
To be fair many settings you can do on the wheel can make life easier. Low-springed pedals make your life easier - also almost no ffb for really fast direction changes and counter steering - thing is if you ever get in a GT competition, which is the goal for many FIA championship players - you're then faced with a fixed setup and you'll be somewhat unprepared for the weight of the wheel etc - and then you eventually (if you're good) get to the GT Academy maybe (who knows), and you'll be all over the place in front of a real steering wheel.
As I said earlier, all these smalll things - eliminating unrealistic aids so the car behaves as close to real life as the game allows ; using a wheel with adequately heavy FFB and pedal strenght - in the long run help you transition to a real car a bit easier as they try to emulate the real feel as much as possible within a video game simulation. That's what I'm personally after - something that feels as real as possible given the available software/hardware in the comfort of my house.