As I stated in another forum, I have not owned amplification equipment for well over 20 yrs that had either balance or tone controls. In my advancing years, though, my hearing accuity has deteriorated making it necessary to either start wearing hearing aids (I've tried this twice), buy amplification that does have these controls or add an equalizer. I don't like the aids and the amps I'm interested in don't have these controls, so I added EQ's which I know is an affront to the sensibilities of many audiophiles.
It's the best single choice I've made in quite a few years; I can now accommodate, at least to some extent, challenging listening room issues as well as correct for my hearing loss which mostly occurs above 3500Hz.
Relatively few of us hobbyists have ideally designed listening rooms and, with age, many of us will experience some level of hearing loss so, yes, IMO, the use of good EQ's is appropriate, even important, for some applications.