Years ago at a winter CES show, the guys from Phoenix Gold hid one of their SS car amps in a big, presumably tube-driven 'audiophile-type' chassis which was sitting between big speakers in one of the home-audio demo suites in the "high-end" hotel of the show. They periodically sat a group of attendees down in about one dozen chairs, closed the suite door, told them what they were about to hear, and then played a 5-minute performance. As everyone was talking and sometimes raving afterward, the MC pressed a remote button and the (motorized) front of the fake big tube amp chassis folded down and out slid a tray containing their SS car amp. Finding that the joke was on them, the crowd usually left quickly (I sat in on several demonstrations in a row). I think the whole thing back-fired; I don't believe Phoenix Gold ever did it again.
Yet people clearly hear, feel and appreciate differences between tube and SS, across many types of listeners/players, situations, and decades of time. And more than a few vote with their dollars. Present reality proves this general truth. If it were not so, wouldn't this industry (and others similar) long ago have converged to the lowest common denominator?