Why do tanks exist?

[Galgarion]

Enmity is a shared responsibility. You don't need the tank letting people die because they don't want to manage their personal enmity, and the DPS don't need to make the tank stay longer in tank stance or use more enmity combos because they can't be bothered to hit a button as an OGCD.

Yeah. One thing I really hate compared to how things were done in older mmo's back in the day, is this modern shrill insistence that threat loss is completely the tank's fault. In the old days, good dps would push their damage while watching their threat, while bads just did whatever. Now, there's no consideration for good teamwork. DPS just wants it their way all the time. Is there even a point to them having enmity bars, since they don't care? It feels like the genre has traded in skillful play and tension for stale repetitiveness and instant gratification.