Can one ever be "done" in this hobby?

Kaitty, you're excused and please don't come back (my wishful thinking impulse kicked in). Regarding the subject at hand, note the word "hobby." Changing components including cables and tubes or whatever can be FUN, and I, like many, don't change things very often except in my case maybe tubes, and that's because tubes are an inexpensive personal esthetic testing device. Otherwise, my sort of recent switch (couple of years) to a small single ended amp and efficient speakers is working for me, mostly because the music coming at my earballs sounds sublime...hobby...fun hobby...

I live in the "twilight zone of zero self control" (Walter Becker line) and in my decently funded retirement I enjoy my self indulgent audio, guitars, a Triumph air cooled motorcycle, sporty German cars, mechanical watches, longboards, SUP boards, an adult long skateboard (Dewey Weber) and whatever else I feel like doing and absolutely care zero about what anybody else thinks about any of it. However, I do crave attention, so there's that.

Power handling and efficiency aren't necessarily related...like saying, "it's heavy, but it's green." I likely use a couple of watts to get my 99db speakers filling my ears and the room, and the peak capability of 'em is 400 watts. You can have a very efficient single 5" speaker that will explode from a steady 20 watts, and an inefficient speaker that will do 300 watts of uncompressed kick drum all day.