This one is kind of obvious but i guess due to shortage of manpower it is not done.
Every sim ever has different default setups for different tracks, not just gearing changes.
Driving silverstone with full aero feels silly and also many faster tracks require stiffer suspension for car to work.
Also different SQ groups should be presented with different default setups aswell. Atm you guys try to make a compromise with one setup but that doesnt really work. Anyone with above 900SQ can feel, that most cars, especially with more grip, have inherant understeer. The Audi R8 LMS being a good example. Zandvoorts last corner is a good place to judge a cars balance. Grip wise LMS cars should be able to go flat out, and you could if you tuned the setup to less understeer, but with current default you have to even brake midcorner to get nose back in. No sharpness. Its unrealistic!
Check what setups people use in F3 or the past open setup races, noone makes them more understeery. F3 itself is one of the least understeery cars but top guys all take over rear wing and add rear arb etc. Only with no understeer can you drive accurately and precise like in real life. With understeer the way to go fast is throw car into corner and use high abs magic to turn the car while leaning on rear tyres without any fear.
The reason i have always talked about open setup is because you guys give minimal attention to setup so there is lots to be done. If setups were done for every occasion then i would rather have equal closed setup racing too.