Trace, Night Cargo, Triple black , CNY, and a bunch of other non collabs sold out this year. So yes UB still sell out.
Saying most UB don't sell out is like saying Jordans don't sellout because they're on shelves. Various UB sold out recently
when OG NMDS released in 2015 there was mixed opinions on them. Some said the eva blocks looked like horrible legos.1.0's were considered as dad shoes until Kanye wore em. When EQT ADV released, there was nothing but positive reviews from them. Strange how things work out