Originally Posted by
Semirhage
This is a natural consequence of Squeenix's job design philosophy. If all party comps are supposed to be viable, then nobody's exclusive capabilities are mandatory. If you make specific mitigation, debuffs, or what-have-you points of distinction between jobs, then those things will never be required/make clearing an encounter significantly easier due to point number one. The only thing that everyone can do is DPS. It's the only metric that ends the encounter faster, and the only metric that (with the occasional exception of weird boss behavior when you phase early) doesn't have a cap on its usefulness. You're basically always rewarded for doing more damage in FFXIV. That's why the community values DPS. It's the only metric that makes a difference after you've covered your bases.
Edit:
To be fair, this is also a common design problem in other single player Final Fantasy games. There comes a point where...why would you Silence or Slow an enemy? Just kill them. You can one or two shot them anyway. Don't waste MP on crowd control, etc etc.