Skills on weapon is a very bad design

Yo!

Would it be possible add the skills on weapons as gems and add a way to upgrade the level of the skills. I've done couple campaign run before new leagues with a cold sorc / Gelid Staff and it always feel bad to get rid of a cool staff you invested materials on.

Same for uniques, in the endgame, lvl 18-19 are easier to find than a 20 and we all know that a 20 is pretty much required for the max link.

There is never a time how the scaling of a skill on an item feels right.