You misunderstood my post to mean my own expectations, while I was simply saying that is the expectations directed at healers. You actually got it right in your disclaimer. Healer who only heals, or healer who only dps is seen a bad by about everyone. If it was me, I'd be more than happy if the game offered most content to be such that the healer need only heal. However as of the moment, the common expectation to healers is to be able to fill in both roles, often in the same fight. However much I want to specialise in one aspect or the other it doesnt chance that in whole picture, I only benefit partially of the choise whichever it is. That in itself is not the issue. What makes this problematic is that no other role is required the same, creating the unfair environment.
Let me restate. If all roles had to make hard choises where they need to pick between stuff that gimps part of their play, then having that choise can be seen good, you can specialise. (I still wouldn't like it but that's personal taste)
When only one role is required to make hard choises that gimp part of their play, while other roles only have good option they can pick, that is what makes it bad. The choice in itself is not bad. Only healers having it is what makes it bad.
Very brief recap:
Taking I to accord people make sensible melds (and don't out gathering on battle gear or somehing)
Dmg benefits their melds 100% of time
Tanks benefit their melds 100% of time
Healer benefits their melds 30%-80% of the time, debending of the choise and playstyle and groups they end up with.
That there is the problem, and reason why people see the choise as a forced thing as it only takes from their efficiency in any way.