Advantage is not the only bonuses highground could give (and it shouldn't give advantage).
Highground has to matter even if it definitely shouldn't be a god mode. Delete the whole concept of verticality and positionning for the sake of "D&D 5e" is a bad idea.
And the point is, like he stated, the difficulty would be "D&D 5E mode" which would entail, implementing 5e rules, height giving Advantage not being one of them.
In his scenario, f you still want to play the game with Larianisms, play on story mode.
That 100% unfair because most players don't care playing a 100% RAW game. There's something between RAW and the "cheap" combat system that is now in the game.
His scenario only give solution for those usually called the "D&D purist" and that's probably a very small part of players.
I'm 100% for a game that is closer to 5e for many reasons as I said in many threads but these difficuty level suggestions are only thinked to satisfy :
- a minority of players that say "the game is perfect"
- another minority saying "the game should be 100% RAW".
