DPS Stance vs Tank Stance Including Healer DPS

[Reynhart]

In a single player game something like that would make sense.

In a single player game, no one would care how optimal your party setup is.

Could you imagine a pug of 8 people who've never played together trying to figure out who is better at what particular mini-role and how every one should be playing as a cohesive unit?

Keep in mind we're talking about optimal setup for challenging content. In dungeons, normal trials, and even several extreme trials, no one will care if you don't drop your stance to attain the best DPS available. And in Savage, you don't run with "8 people who've never played together trying to figure out who is better at what particular mini-role", so it's not that big of a deal.