Earlier quoted context omitted.
I went to a smashing pumpkins show and was so turned off that I stopped being a fan. I have met several others with the same experience
Since I don't go to live shows, I tend to just have the disappointment of finding out that I only like some of my favorite bands' albums, because the arc of their own musical careers doesn't match my own tastes. Why can't performers just stay the same forever, producing a never-ending sequence of similar but distinct works?
Because they're artists. Even the record company-manufactured acts consider themselves artists.
On a human level, they're already performing the same pieces of music thousands of times - in rehearsals, concerts, recordings. It must get incredibly tedious after a while. You want them to write the same type of music all their lives as well? You monster! :-P