To jump into the middle of this mess
Would you like the game less if being higher gave you a +1 or +2 bonus rather than an advantage ?
That's not D&D 5E rules. The DM awarding advantage where they think it is appropriate is.
The fact that many of us are arguing for a +1 or +2 high ground bonus, even though this is not 5e RAW, is evidence that we're not just
in that grumpy, clueless "I'M TOTALLY AGAINST WHATEVER THAT IS NOT IN RULESET FOR TABLETOP!" angle that usually summarizes their takes.
Technically, adding advantage for height
is in the ruleset; it's just a bad rule that makes the game less fun and tactical.
