I think that ZU will at least tease out the "basic" good moveset ideas for Pokemon in that format. I think it's clear that in general, Uxie is a defensive Pokemon that runs rocks, knock, U-Turn and STAB -- and that's exactly how it's used in ZU. There will be nuances based upon the different metas in each possible format, but the general gist is there for people who only care about the general gist (or don't care about ZU, or play a different format, etc).
My argument is that a hackmons Uxie set (hear me out lol) ceases to be a Uxie set. It is a set for Uxie in a different universe where it can access every move, every ability, every EV, etc. It's helpful for people interested in that, but for everyone else who just wants a Uxie set, the ZU content is going to help much more.