I'm not sure if I see what you mean. My go-to sneakers have a white trim along the bottom edge and it's just... there? Yes, over time it gets dirty, but then again, so do all shoes in general. Perhaps I simply don't understand what problem you're trying to highlight?
It's white, optimized for showing dirt. It's closest to the ground, optimized for getting dirty. And (In the case of your typical sneaker) It's a special weird porous rubber that is difficult to get clean, optimized for quickly looking like crap.
And when your shoes look like crap it's time to buy new shoes.
Have you considered that you don't have to throw out your shoes just because they're dirty? You don't throw away your clothes when they're dirty, do you? What about dishes? I buy new shoes when my old shoes are broken and they can't be fixed anymore. If you like to throw away your shoes when they get dirty, you do you, but in that case you'll be throwing money at the very same industry you seem to strongly dislike. As a saner alternative, I recommend not caring so much about what your shoes look like, they're just shoes.
From anecdotal evidence, I've got the same pair of sneakers for... 4 years now I think? I'm using them daily and yeah, they've got dirty on the bottom, but I wouldn't consider throwing them out just due to that. I'll replace them once the sole is damaged to the point the shoes stop performing their function.
At that point, it doesn't make a difference whether it's white or black for the sole.
You could have made your point two replies earlier and it would be more clear what you consider the issue with white rubber to be.
