After sinking over 750 hours into testing this game through the alpha and beta, giving my recommendations on how uniques are mostly terrible and not useful, a bug entered the game on launch that should be viewed as a blessing in disguise.
The ability to upgrade uniques from their current state to add stat lines, sockets, and the ability to craft on those items using rng crafting materials is the answer to those concerns.

I am writing this to petition that this ability be left in the game because it not only makes uniques that would otherwise be useless in the end game usable, but it adds a meta game of crafting with a sizable money sink for end game grinding, helps make more unique endgame builds viable and opens the door for great customization. You should definitely consider leaving this in the game even if it were slightly nerfed by reducing the stat lines added to 4 instead of 6.

This is the only way I can think of that saves uniques in their current state (which is the state that they have always been in) while also adding to the end game experience.
Please respond below if you agree with me so we can impress upon the devs that this is a good thing to be in the game.

P. S. I love this game, I just want to help where I can.