Whoever thinks DPS have less burden of responsibility than tanks or healers is gravely mistaken. I see examples using Titan's heart phase, but I can think of plenty of others.

The strain that it puts on tanks with their off-GCD limited cooldowns and rather limited TP resource, or healers on their MP, when DPS perform poorly, is immense. Have you ever healed or tanked on Brayflox's Longstop with both DPS players not even having their jobs unlocked? I have for either role, and it's awful. Haukke Manor story mode with DPS who don't understand the most basic spells/abilities and how to use them in rotation for maximum dps? Archers who can't wait 2 seconds to attack mobs till the tank pulls them in Sastasha?

DPS have incredible responsibility, not just on straight-up dps checks.

Stop spreading myths claiming otherwise.