Uprising is still on my watchlist, I don’t know if this is a fan art thing or a canonical thing but it appears… uprising! Tron has a combination of both styles of circuitry, he has the sleek minimalist kind of the new grid but keeps some of his more “wild” and numerous branches.
If this is true — absolutely scratches my brain, it also implies he chose to or was forced to cut down a bit. I don’t know if this implies more restrictive clothes or? Either there’s a sense of style to lessen the  circuits, or “basic” really means basic/ less complexity compared to Tron (this could also do with his age)
All I can think of is this
They’re jealous of old programs whimsy. (Not saying there’s not really neat designs in the legacy verse but it’s a lot less “retro futurism” and a lot more “minimalist cyberpunk” I feel like there could’ve been more of a meshing)