This. I've thought about starting a compendium of Common Sylphie Fallacies that we can keep linking back to, because I've linked my refutation of the "HURR DURR HEELERZ SHULD ONLY HEAL" talking point a bunch of times already, just to save myself the time of retyping the exact same response to the exact same argument. It's as if Sylphies were in-game NPCs with the same three lines of canned dialogue they repeat over and over:
"Healers should only heal, it's in the name!" (Healers in FF14 are healers in much the same way that the Democratic People's Republic of Korea is a democracy.)
"Pressing the 1 button is literally a Savage-level uber-l337 hax0r metagaming speedrun strat and you're a meanie for asking me to do it!" (Fallacy of the excluded middle: there's a wide middle ground between "carry me plz uwu" and "world-record speedrun" levels of effort)
"But what about One-Armed Grandma?!" (Ignoring the question of why all four healers must be lobotomized for the sake of One-Armed Grandma, who might want to play a DPS or Tank job instead. And of course ignoring all the gamers with disabilities who play much harder games than FF14 by finding ways to compensate for their disabilities. Or that One-Armed Grandma could explain her situation at the start of the dungeon with a chat macro.)
Mathematically disproven: https://forum.square-enix.com/ffxiv/...=1#post5973381
The short version is that without healer DPS, even the world-record E8S speedkill would have failed to beat the enrage timer. Nizzi's post goes into the details, but the math is quite simple. Take the party DPS recorded in the log, subtract out the healer DPS, compare to the DPS required to beat the enrage timer. And this, again, is the #1 speedkill run, so presumably, the DPSers and Tanks are playing as close to perfectly as possible.