I think Paladins were at their best when the gameplay was a bit slower and more methodical, and hits felt heavier and dealt more damage. One consequence of the Holy Power system is that Crusader Strike hits like a wet noodle now, which I’ve never been cool with.
I think, ideally, I’d want Holy Power switched with something actually unique, and I’d definitely want the Seal system to return. Maybe Seal Twisting as well, that was kinda cool. I just like Seals in general. Also remove Inquisition, it’s just a braindead buff.