In the 10+ years that I've been on Audiogon, I've observed myself evolving to some extent. My tastes used to be described simply as "lean and detailed". I still do appreciate that, but now it's something much more complex like, "Musically involving, incorporating inner and outer detail with spacial realism/imaging and depth". But the gear that I liked back then I still like, and the stuff that I thought was overpriced and not worth it is still, well, overpriced and not worth it. In fact, I haven't purchased any item in several years, so I must have it dialed in OK.
What's changed most about me, though, is my musical library. I've created a nice music server full of music that I'd never heard of back then. I used to listen to classical, rock, and pop. Now New Age, Bluegrass, and Jazz are some of my favorite genres. This has changed so much more than my choice or preference for certain types of gear, or tubes vs solid state, etc.
Looking back at my older posts, I'll stick by them as still relevant and appropriate opinions even today. To me, the fundamentals (speaker/room interface is VITAL, amp/speaker matching is significant, and preamp/amp matching is important as well) haven't changed.
I guess the executive summary of all of this is that for me, anyway, it's the preference for the music and not the audio gear that has changed the most.
Michael