People use "we're not an action MMORPG!" as an excuse for this game's bad netcode making unfeasible precisely timable interactions and gameplay less centered around bar-watching (sensitivity to timing and having reason to 'watch the screen, not the bars' being core to "aRPGs").
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When most say they "want Holy Trinity combat," they really mean that they want tanking, healing, not only be constricted almost solely to their respective quarters or fifths of a party, but also to be --through specialization and its passive impacts-- shallower tasks mostly consequent to just playing as normal so long as one has the given role. Put more simply, the want Tanks, not any gameplay of tanking, and Healers, rather than any significant and unique decision-making by way of healing.
Meanings will vary with time, place, and occasion, and the points of threads will evolve over time. If that has landed simply on "opinions that are presently or have been historically contentious within the game's community," so be it.
(And, btw, one can have an opinion on what music was interesting to them without having a degree in "musicology".)