The arguments about height advantage are less about the numerical value of it, and far more about the sheer tactical value of its existence and how it affects the value of AC. You brought up the advantage part, but I see you are downplaying the combined effect of the DISADVANTAGE half of it too. Not to mention that its very existence also makes damaging spells targeting saving throws inherently worse to use compared to spells targeting AC in the vast majority of practical situations.
So I ask this. What is the actual benefit in keeping high ground advantage the way it is, knowing how much of an effect it has on encounter design and balance? Because if your only argument is literally 'I personally don't think it's as bad as people say it is! (even though it's probably THE most common mechanics-related complaint)', then maybe there actually *is* something wrong with it to begin with.
Some people have at least tried to suggest changing it to a +2-/-2 AC calculation instead (and reverting the changes Larian made to AC/HP in favor of pumping proficiency values instead so that saving throw-targeting spells aren't left behind in the dust).
