stratton,
I think you have missread my post. I was talking about, if ALL gear were tube based, not just guitar amps. Certainly, some intruments benefit from the use of harmonic distortion and some don't. Same as with music, some styles benefit from that distortion while others don't. Back in the analog tape days, recordings made with tube mics, preamps, consoles, etc, all going to tape would introduce a considerable amount of distortion and the resulting sound would be dramatically different. This is the real reason why solid state equipment came about, because we wanted to achieve a cleaner, truer sound to our recordings.
The distortion introduced by the analog tape is the reason why we went to digital tape, sames as with analog consoles to digital consoles, etc, etc. The problem is that, like I said before, these new technologies took the warmth out of the recordings since we were missing the character of the distorted sound and so the recording engineers brought it back with the use of analog tube gear (compressors, preamps, mics, etc).