Just wondering if worth keeping low level uniques?
Possible to do a build around 50-60 levels around them? Or just progress slowly what we can that level?

Will it be possible to level them up later?
If I have seen a feature in the City, but not unlocked them, not sure how is it working?

Have a Macksfesten Enneract and missed to buy a Frostweave Qullituq from Merchant as Gold was low, did I made big mistake or not?