a Rogue would for example not get automatic sneak attack for being above the enemy from constant advantage but need to have an ally next to the target
I know that having ally next to the target is allready working ... For me in most situations its more used variation, since its easier to get.
I didn't say ally-adjacency wasn't working.
And it's definitely not easier to get. Putting your ranged people up high will give you advantage on nearly everyone, rendering ally-adjacency and other sources of advantage moot in terms of sneak attack validation. And every battle scene by and large is designed to allow you to take a position above the enemy, often before the combat even starts.
