Me myself don’t actually mind that bonus removed in matter of “difficulty” of defeating whatever and whoever. On the other hand I agree that LEGENDARY weapons should have something special, unique and different, so those get more attention of players.
One of those things is for example the glow, which some of those legendaries provide when equipped. Or Riptide with waterbreathing. Or “stupid” Lying bastard sword with prolongued reach and axe traits.
We need more of this. Any weapon damage bonus is easily to be boosted by potions and other consumables. I personally don’t seek more numbers in total dmg or AP. I would love to see something new, which is slightly rewarding for the player and somehow unique.