Because perspective. You have 500k sports car that tops out at 250mph. New regulation requires engines outfitted with governor and now you suddenly can't go over 100. Avg Joe says wry so serious! You don't need to go 250 anyway! A car is for travel! You just want you're epeen! Some might have that car to show off epeen. Some might because faster is fun. Race car driver says they need it for work.
Regular cars now set to no more than 20mph. Omg not fair! I need this car to go faster to get to work and get my kids from school! Unwarranted nerf! Oh NOW it's a nerf mr avg Joe huh?
Some view dps as a luxury that doesn't really matter and the elitest need to get over it. Some see big numbers as fun and therefore the purpose of the game. Some view it as a necessity to function, but the truth is in the middle. Numbers and their relation to fun, necessity and epeen are all intertwined and vary from person to person, just like the speed of a car is relevant to driver fun, epeen, and basic practical function and the lines dividing those categories are subjective opinions.
I currently play ninja in my raid group and we are struggling as a team to meet a dps check right now and may just barely squeeze out our 1st win this week. Nerfing ninja yesterday would severely hamper that effort so it's very practical for me. Similarly I would have an even harder time if I were a drg instead right now. What's fun for some, others see as showing off and others see is practical necessity. It's not that black and white.