Height advantage is here to stay end of story! Live with it or get a new game just a friendly tip. It's not going anywhere, verticality is one of the main features of BG 3 so good luck changing that.
Height advantage was always huge in combat when you have range elements involved so nothing wrong with it. They just need to make AI better at using it. And maybe make GO Prone - crouch an option for all characters... if anything we are missing overwatch (bows and spells) and after all those we can finally call it tactical combat...
