Should Cleric Stance be disabled in party instances?

[Lmcgyver]

Do you really think that a SCH "is fulfilling their requirement to the party" if they /follow the tank and go afk while letting the fairy heal, if no one dies?

Fulfilling their requirement, yes. Fulfilling their potential, no.

(in other words, if the other members are willing to put in more effort).

That's just the thing. The healer is not required to DPS, and so them not doing DPS does not require everyone else to put in more effort; rather, by a healer doing DPS everyone else ends up putting in less effort. I'm pretty sure that this is part of the reason there are lazy DPS around; they expect the healer to pick up the slack so they can do the bare minimum and get carried.