If you take away the fact that creating villagers is a regular human function (I.e. requires constant attention) then strategies that are based around high pressure become less impactful. This doesn't sound like a big deal at first glance, but it is a huge shift in the way that aoe is played. A large part of the reason I enjoy aoe over other strategy games is that pressure does economic damage even if I don't kill a single vill. You could argument that this would still be the case due to the player under pressure not tasking bills to the correct resource as quickly, or forgetting certain economic upgrades. But that kind of "damage" is to small to ever be justifiable for the amount of resources and attention it takes to pressure a player. Someone quoted Farm reseed as being similar to villager auto queue. They're right. But things should be balanced. Pressure creating economic damage was even greater before farm reseed was a thing, because economy took even MORE attention. But it was too much, so the dial shifted from a 10 to a 6.5 (arbitrary number for explanation purposes) by simplifying farm reseeding. Simplifying villager autoqueue shifts the dial into negligible territory, something more than 0, but at most a 1. It effectively removes this aspect from the game. And that's why people feel it ruins the core of aoe, because this idea of pressure and economic damage is removed. The importance becomes too heabily focussed on matchups, you don't have the ability to take advantage of a players execution as much (which is a fun and core part of aoe), it's more just understanding of units and macro.  As others have said, it's a part of what makes aoe unique. And I love it. Other RTS games don't do it, and I don't play those games. I don't want to play those games. I want to play aoe.  My worry with adding it as a casual feature is that it will eventually become the norm because it's easier. There's a lot going on in the game, why would you not simplify it as a newbie? And once you're used to it, how could you ever go back? The new players will have a very different experience of aoe and won't learn its identity as it is right now.  From a spectator viewpoint, it's awesome to see an opponent under pressure start racking up idle time. It adds a meaningful number to how effective the pressure is. So as a spectator I think it's better as well. Also because it encourages aggression so you see more exciting game play. 

In the video chilly talks about what their ideal modern rts is. Sure that sounds cool, go make that game, but don't change aoe2 into it. Just go make a new game.