You guys do realize that same/similar words can mean different things depending on the context and field they're used in, right? Many acronyms sound like words that mean something totally different. Languages also evolve constantly and words gain completely new meanings due to slangs and such. The brought up acronym is generally what people refer to when they use the word in the context of MMOs and it has little to do with for example act of metagaming in tabletop rpgs, just like an MMO "tank" can have absolutely nothing to do with an armored war vehicle. It might've been a backronym originally, but it doesn't change that that's what it is used as these days.

Anyways meaning was the point here, not etymology which is rather off-topic. Regardless of what you want to argue the word comes from, the meta is not affected by what a healer's dps kit looks like, but rather what said kit's overall output is and people asking for more complexity are doing so due to concern with engagement, not effectiveness.