Secondly, your presumption is that high end raiders who heal will suddenly tunnel on only the tank? sure, that's possible. i really doubt it, they don't typically get to that point by developing bad habits. I really think that they
prioritize the tank , just as they would
prioritize themselves, which is a completely different thing. That doesn't mean their attention is
exclusively on those 2 party members, nor does it have to be
exclusively on healing throughout an encounter. The comment about mechanics being hard to avoid ? I'm not sure what you would expect. Healers are normally going to use various tools like aoe regens, shields, etc however at a certain point, if someone insists on collecting vulnerability stacks, or if they insist on having some on-shot mechanic dropped on them, their future isn't going to look too bright. That's on them.
However, where you go on to claim that " The problem especially exists in games where healers are expected to DPS as well,' considering that most games expect healers to DPS as well, and that healers are "shocked' when dealing with 'ordinary" people? along with 'culture shock and resentment" ? I honestly have no idea of what you're talking about. if anything, it's quite the reverse, sure there can be the exception, but from what i've seen the healers that join DF are typically expecting sprouts and people who consider that they're only being healed if they are at 100% health all of the time.
however, I'm a poor reference for healer woes, check this link - we still have the highest number of votes its seems - up to 90.
https://forum.square-enix.com/ffxiv/...tions%21/page9