How many of us are truly satisfied with their systems?

I agree, don’t go to audio shows. But for a different reason. Because the sound generally sucks, very generic at best, so you’ll be disappointed and get a false idea of what’s possible. ☹️

Prior to my move in 2018 I hadn't changed anything for many years.  I had the same speakers for over 25 years and I've had the same Amp for 21 yrs (one repair/recap).  DIgital sources having evolved somewhat over that time, I went through three iterations on the front end.  Now that I've settled on replacement speakers, and once again look forward to listening each night, perhaps I will retreat back into that happy stasis.

The amp does run a little hot... :)

If someone has been satisfied for 10 or 20 years, I may start to believe him.

If an audiophile says "I recently introduced X in to my system and it's so wonderful I'm totally satisfied and I'm 'done.'"

Then this means nothing.

 How about If a persons system has been unchanged for four years, and that person says they are absolutely thrilled with the way things are. Does that mean anything?

Not really. Everybody says he’s absolutely thrilled with his system. Even your humble scribe.