I too wonder that. And it is true on an OS level as well. The only worthwhile change in desktop environments since the early 2000s has been search as you type launchers. Other than that I would happily use something equivalent to Windows XP or (more likely) Linux with KDE 3. It seems everything else since then has mostly been bloat and stylistic design changes. The latter being a waste of time in my opinion.
Of course, some software other than desktop environments have seen important innovation, such as LSPs in IDEs which allows avoiding every IDE implementing support for every language. And SSDs were truly revolutionary in hardware, in making computers feel faster. Modern GPUs can push a lot more advanced graphics as well in games. And so on. My point above was just about your basic desktop environment. Unless you use a tiling window manager (which I tried but never liked) nothing much has happened for a very long time. So just leave it alone please.
>The only worthwhile change in desktop environments since the early 2000s has been search as you type launchers.
Add to that: unicode handling, support for bigger displays, mixed-DPI, networking and device discovery is much less of a faff, sound mixing is better, power management and sleep modes much improved. And some other things I'm forgetting.
There are some people who would exclude all of those an enhancements because they don't care about them (yes, even Unicode, I've seen some people on here argue against supporting anything other than ASCII)