Guild Wars 2

Im thinking of getting those + a few sets of armor with differents stats, is it worth after celestial stat change?

It is much cheaper to get several sets of ascended jewellery than armor, so 1 set of ascended celestial armor to mix with other stat combos on ascended jewellery is a viable option for engineers.
If you’re talking about exotics just make full sets (jewellery + armor) of the required stat combo.
Celestial is very versatile but lost quite a good portion of its damage with the latest release, so besides the one armor fits all builds option, I wouldn’t bother.

Waiting for Cognition to post on this lol.