I understand this argument, but I fundamentally disagree with its core premise in PoE. I hate to break it to you, but an auction house already exists in PoE, and guess what? It didn't completely break the game.
Since we already know this is the case then maybe they should just streamline the process to kind of mimic the existing external architecture that people are already using. Additionally you could just make trade and no-trade servers so people who want a solo or more hardcore experience still have that opportunity.
There are ways around the issue that don't just boil down to "auction house no fun because GGG or Blizzard say so UnGaBuNgA".....