I haven’t heard their recent albums, although I did notice that the last album I heard (from a decade ago?) was a little more subdued than their earlier stuff. So? Most musicians and bands seem to slow a bit, creatively, as they age. Or they break up early (like the Beatles) or they get themselves killed at a young age (like so many rock and rap stars). But most people still like to hear them perform live (the ones who are still living). I’d see U2, except that I don’t like the big stadium concerts these days. If they ever played at someplace like the Birchmere (which probably won’t happen), I’d definitely go.
I see other older groups and performers at places like that, and most of the audience enjoys the shows. Call it nostalgia or whatever. But there’s a lot of “music” I see on TV and YouTube, and I don’t get it at all, even when I try to imagine if I would like it if I had heard it as a teenager. New music isn’t necessarily great just because it’s new. At the same time, it can be entertaining to watch older groups and singers who used to be superstars but are now playing in smaller venues, where you can sit up close and chat with them after the show.