Windows 11 is basically Windows 10 with a slightly nicer (in most respects) desktop. There aren't a lot of compelling reasons to switch if what you have works well enough.
Windows 11 is also much better at collecting personal data with improved analytics and Microsoft spyware running under the hood. Not to mention it's superiority at serving advertisements and embedding them in nearly every aspect of the UI.
It's doubtful that Microsoft shareholders have meetings about how to improve the user experience of their OS. I think they are more concerned with extracting every penny they can designing the most efficient backend to harvest data and push ads, kinda like our friends at Alphabet, Microsoft is trying so desperately to emulate.
Maybe the web results when searching in the start menu? This was previously a local only search and is now a severely degraded experience out of the box. I used reg keys to disable the web search feature long ago and return the prior functionality.
That's why I said in most respects. The Windows 10 start menu is way more configurable. It doesn't waste space for "recommended" apps either. In Win11 it is possible to reduce the space eaten up for recommendations but not hide it. The way pinned apps flow left to right and down is annoying too for spatial positioning. An update added icon groups which is something. I think the rest of the desktop, things like the control panel, task bar is a lot slicker in general though.
The Windows 10 start menu is way more configurable. It doesn't waste space for "recommended" apps either.
It's twice the size as it was in win7, and 100% of the extra space is used to display icons for apps that I don't use, don't want, and can't be removed.
The control panel being much easier to navigate versus all the changes they're making in settings along with what they're hiding behind powershell commands is another reason.