I don't have a raspberry pi in the car, I have an older DIN car stereo. RPI was used as example that this isn't hard technically. Also left 64GB behind many years ago for non-car applications.
It’s more likely poor programming than lack of cpu power. I personally prefer filename sorting rather than metedata sorting for this reason.
There’s very expensive stereos that might do it but they tend to come with Android etc, and those companies don’t want you to be self-sufficient.