Nobody needs it. It's a luxury product. If you don't want a 600w GPU just get a different one. I only recently upgraded from the 1070 that's served me well for almost a decade. Didn't really notice much of a difference even though I splurged a bit.

Buying top end gpus these days seems to me like a total waste of money unless you have very specific needs. For playing any mainstream game at 1440p you'll be completely fine with a mid-tier previous-gen card.