I know I'm not as eloquent as Bashiok, but I hope that makes sense. Alex is an old school dev, and I get what they're trying to do. They're valuing a more quality experience for mains higher than better support for alts. If I had to make my own "design decision" analogy here, it's sort of like how Watcher says they don't design their non-matchmaking raids around pugging. It's still possible to pug them, but they'd let it happen more organically on the player side, like the decision to level multiple alts. It's just their call on that, for the betterment of the game. Sometimes they have to make hard calls like this to extend the life or improve the quality of content.