There are considerations, so Ill admit that.

However, tank stance on all the time should not be the default mindset. If your healer is struggling really hard, yeah, tank stance may be a good option. If youre extremely undergeared and unfamiliar with the class, yes, tank stance is a solution to that problem. It should not be the go to solution in every case. Which is the point Im trying (but failing) to make.

This game, as it stands, is not designed for "Tank stance all night long". Its designed for certain things and situations, but broadly, you should be in DPS stance doing dps, and if necessary using tank stance as a cooldown for busters. Again, theres a lot of factors at play here. This will also mean yes, healers will have to get better, and DPS will have to to.

As an example: Tank is decently geared, and understands their class and role, and is doing boss mechanics 100% correctly. If theyre still dying, it is because of one of a few reasons:

1) Healer is not great geared and is struggling
2) Healer does not know their class effectively to work well with the tank
3) Healer is over taxed due to DPS eating every piece of damage and not trying to help with mitigation.

Two of the three of those issues can be improved by better players. DPS who mitigate damage/do mechanics right to reduce healing necessary, and healers who better understand their class to work well and more efficiently during heal intensive fights. This is why I think we need to start promoting the idea players need to improve, and stop making excuses. That means tnaks need to learn stance dancing and their class decently, DPS need to learn threat management and how not to eat damage, healers need to be better about how to manage heals on tanks and dps.

Im not saying every healer is a baddy, or dps, or tank. Rather among the more casual base, there is a bit of apathy towards the idea of learning to be a mean efficient healer/dps/tank. And if we want to stop having "baddies" in our groups, then we need to start promoting the idea of people getting better. So yeah, in the terms of tanking, that means not relying on tank stance as your bread and butter.