Between cloud apps and RemoteApp technology, there is a pretty decent chance for Linux desktops with Windows servers becoming the norm, again, for smaller size businesses. Organizations I work with still use thin clients, which - what’s the difference? And based on end user reactions to the UI when upgrading to Windows 11 - all change is hard. They’d get used to it fast. Especially if it acts mostly like Windows 10.
What are you doing with your machine that would be confusing for your standard end user? KDE out of the box is good enough for my daily driving. PopOS, Bazzite, and Mint work great. GUI options for most normal computing things you’d do these days. The amount of customization allowed on an end user’s machine is often minimal anyway. Plus, you sorta imply that the end user would be doing all this, instead of an IT admin preconfiguring a machine with Ansible or a custom install script. I think you may be over estimating what your typical business user does. It’s mostly “Here’s my chat, here’s my browser, here’s my 1-5 LOB apps, here’s my printer. Can I change my background to my kids? Great.”