I have mixed feelings. I think it is up to an individual to make their own choice and if they choose to use tone controls to tailor the sound of their system then I can't see why that should be a problem to anyone else.
Personally I have never used them. I always used to think I needed them 'just in case' but on all the Marantz, Yamaha, CA, Rotel, NAD, Onkyo, Arcam, Pioneer etc. amps I've had I never used them, apart from initially checking what effect they had on the sound. The only useful such control I've encountered was the variable loudness on the Yamaha A-S500 which did make the amp more listenable at lower volumes, but then when you get a better quality amp with a better volume pentiometer and a better power supply you don't need that control to compensate. As others have mentioned where I have tried using tone controls I have found them crude anyway.
I'm quite happy having an amp without tone controls or loudness. In fact my Exposure (and the Creek 4330R that I also loved) are about as simple as an integrated amp gets. No speaker switching, no headphone output, no tone controls, no loudness, no filters - just the means to amplify the source signal, control the volume, and switch between inputs. Even having had amps with substantial feature-sets such as the Onkyo TX8050, I never once miss those features because the amp sounds so superb. I do however feel that an amp can be well executed sound-wise and still offer features, as Rotel's models consistently prove.