Eh. People don't say "hey, bring your AST because they bring so much rDPS." They say, "hey, bring your AST to boost my dps." There's a bit of a difference in how that ownership gets perceived.

I wouldn't say that Cleric Stance represented a "heal/don't heal" dichotomy. It preferentially encouraged oGCD healing, which is still the case. You can have both healers actively contribute to healing at the same time, any time that they feel like it. It'd probably be overkill in most situations, but you can still do it. At no point do you ever really stop being a healer.