It seems that some weapons have charged attacks just by holding the attack button, while some have charged attacks that depend on charging a certain attack in their combo and not the first. Other weapons may not have charged attacks at all.
This is confusing as a player, especially when I can roll an “extra effects on charged attack” type enchantment on a weapon that doesn’t seem to have a charged attack at all.
In my opinion, charged attacks should be a system that every melee weapon has access to on the first hit. I’d also be open to expanding that to include every ranged weapon as well.