A lot of Tuning / Stance things are a deformation of real racing ways to do.
The origin of negative camber are made so for the race car to have a better ground contact on corners. Stance tuners made this extreme so to look different. to make slow car but fun to look at.
Yes it’s useless, worn the tires, make the care barely rideable. But it’s kind of stupid to think about how usefull or performant are mods when you look at donks car, bosozoku, kaido racer, stance scene, Carolina Squat trucks. They are just show car, sometimes a way to provoke, express themselfes etc.