It feels wasteful to have to discard perfectly useful items, because they look worn out. We all know that black, dark items tend show the least amount of wear, and in the interest of efficient frugality, some of us gravitate toward that instinct.
You look at a white t-shirt, and you know it's going to show pit stains by the end of the year. A black t-shirt might show some white accumulation inside the armpits, but not outside, and you really are only going to have to trash it, once some holes show up. Same with socks.
So too with hi-viz stuff. You just don't want to buy something, and throw it out, the moment it gives a sense of unintended imperfection. It's more an equipment maintenance perspective, than a live, situational awareness point of view. The best equipment is the stuff you have, and the stuff you have is the stuff you keep.
Being a little OCD, but that's what's going on under the hood, from my own perspective.