Maybe, for some of us, speakers being (mostly) big and/or heavy, hard to get past our partners, and hard to find, are the last things we generally tend to change. Speakers, which I work very seriously to get right when I commit to changing up, tended to stay, say, three to five times longer than almost any component I’ve ever had. In fact, in over 35 years in the hobby, I’ve had five sets of diligently researched and loved speakers. And it’s only because a good portion of that was spent in apartments in New York City, I couldn’t hold on to any speakers I wasn’t using.
I certainly would have hoarded some of them if I had a good basement or garage anywhere along the way- before we committed to a real house.
Amps come in second. You can live with a good amp for a long time. My in and out component sickness has always been preamps and DACs.
Both are infinitely more interesting to screw around with, for me. I’ve had dozens of both. Solid state, tubes- it’s all good. And the thing with the tube units, I don’t have to switch it up so quickly if I come down with a little audio nervosa, I can obsess with different tubes.