It may be based on your mental categories.

Let's say you were born in 1910. The revolutionary stuff (at the time) was applying electricity to stuff. Well, by the time you were 30, you'd seen all that. "X thing that we'd done before, but now done by electricity" wasn't a revolutionary idea any more. And by 1940, the really revolutionary advances in airplanes had mostly already happened (although the switch to jet engines was still to come).

What did it take to be revolutionary to a 30-year-old in 1940? Penicillin. Color television. The computer. There were still revolutionary things happening, but the bar was raised.

Or take the 1980s. It was revolutionary. Everything that people were doing anyway, they figured out how to do on a PC. I remember that time. Every month, there were new things possible, things that I didn't even think of trying to do on a computer.

By about 1990, that was over. Oh, you got the computer to do one more thing? I'm not surprised any more. I've seen that a hundred times over the last decade. It's just one more thing now.

Same with the internet. At first it was magic. Now, you can do one more thing on the internet? Yawn. Of course you can.

What's revolutionary now? AI. Twenty years from now, it will be a yawn too. Oh, you got AI to do one more thing right? No big news.

TL;DR: I guess that after a bunch of changes that can all be lumped into one bucket in your thinking, more changes in that bucket don't seem as interesting as the first few did.