It does not add depth to the game i assure you, I’m a vanilla player and i played since launch and played for many years, I’m part of that actual Diablo 2 fanbase, after those pools I thought the same as you, so i decided to join my friend on one of the mods and tested all those features by myself to see why so many people want them and now I understand why, go a do the same and do it like you mean it before you tell us it’s game breaking
see what i wrote about it in here if you wish to get some more insight: