I think in the '80s it was fashionable to have bass, treble, loudness, graphic equalisers, dancing lights, bass boost and much malarky.
Then it was trendy to buck the trend and go minimalist.
Has anyone ever noticed the difference between 'direct' and with bass and treble set to neutral? I haven't.
So if, like me, there's no discernable difference between direct and controls set to neutral, whats wrong with having the facility?
Not to compensate for equipment you bought but don't like but to add a bit of oomph to dry, compressed recordings.
On the other side of the coin, my amp has no tone controls or anything and don't miss them generally. And it stops me fiddling and just accept the recording the way it is. And for me, this is best, but I wouldn't avoid an amp with tone controls.
The CA 840A I had for a while had tone controls but were well done and didn't detract otherwise.
Only my opinions, but they are of course right and anyone who thinks otherwise is clearly wrong.