(a consequence is PoE2 having some of the worst gear in all RPG),.
How....???? That's a gold standard of item design.
Not only you get a wide range of unique weapons, that can compliment variety of role-play and builds but they stay relevant throughout the entire game. While in Baldur's Gate2 there is a handful of items you will actually use on multiple playthrough.
Then again, I don't find +4 weapons, to be an exciting change from +2 weapon. I would rather keep the balance stabe but add unique properties... as PoE2 did.
BG items had both +4 quality AND unique properties.
The unique properties in PoE2 sucked. Killing a Mega Boss in the highest difficulty to get an trinket that gives you an effect that lasts 6 seconds once per day feels like being castrated, such is the frustration.
A cape that has 1% chance of granting Brilliance? Really? Where is the +4 perception from the first game?
That mostly applies to armor, but most of the weapons sucked too. A consequence is that stuff like Scordeo's Edge and The Red Hand seem like being from another game, such is the power difference compared to the other weapons.