Or here's another question: why do things like Battle Pathfinding or early invisibility break the game? Because they significantly simplify clearing the map. And why is that bad? Because clearing the map is the main element of the game.

I've always disliked this in multiplayer – the main element (in my opinion) should be the interaction between players (by the way, this should also remain the main element in single-player, with the only difference being that the human player now interacts with the AI player), but instead, we've gotten used to the fact that 90% of the game is just clearing mobs – it's not a very appealing experience, and the cherry on top is a couple of battles between player armies (sometimes it even comes down to just one final battle – which is absurd, because it's no longer a strategy game!).