In D&D, using CHA for weapon attacks is a Hexblade thing, not a Pact of the Blade thing. I might have missed something about how Larian is going to implement Warlocks in release, however.
Fair point, I was thinking of the new 5e playtest version of blade pact, which closely aligns with bg3's mechanic.
To your point (from Hex Warrior feature of Hexblades):
"The influence of your patron also allows you to mystically channel your will through a particular weapon. Whenever you finish a long rest,
you can touch one weapon that you are proficient with and that lacks the two-handed property. When you attack with that weapon, you can use your Charisma modifier, instead of Strength or Dexterity, for the attack and damage rolls."
So it still would only apply to one weapon.
