I don't mind an EQ in the loop or in post, it's just part of the puzzle and another tool in the box. Especially in the "old days" with fewer amps, or more expensive amps not readily available and so on. I wouldn't fault anyone for picking up a $400 JCM900 and throwing an EQ in the loop and using that as their main amp.
However now that there are seemingly infinite amp makers of all different flavors, and that $400 JCM900 is now a $1000 "vintage" amp, I really can't see the argument for EQ's in that situation. If you can afford an amp that has a core, base tone that you love, without EQ, then go get it. You can EQ here and there but it's less necessary. I can't fathom some of the advice I've seen (elsewhere) that's like "buy this $1000 amp then add an EQ to get a good tone" when that same $1000 would just buy an amp that is good out of the box.
I'd liken it to recording video, or shooting photos. Can I touch up your photo? Can I reduce noise or color grade a video clip? Absolutely. But if the photo or video was shot correctly in the first place, I have a lot more range in editing, as far as both the quality of those touch-ups while simultaneously having less touching up required. So think of it the same way for an amp, if I have a shitty tone, I can lipstick it with an EQ all I want, and it might sound anywhere from "unique" to great. But if I start with a great tone already, it just gives me that much more flexibility.