This isn't how tactile buttons in modern cars work. You're doing the same thing as pushing keys on a keyboard. The software can still be slow.
Turn the physical volume dial on a car with a slow Apple CarPlay interface and tell me how that works out for you.
Oh, it's too loud? But it takes 2 seconds for the software to respond due to lag and now you're fiddling with the volume button trying to not make it worse?
Turn the physical volume dial on a car with a slow Apple CarPlay interface and tell me how that works out for you.
Oh, it's too loud? But it takes 2 seconds for the software to respond due to lag and now you're fiddling with the volume button trying to not make it worse?
A physical button didn't fix that.