Maybe because your friend isn’t the average user (specifically when you mention they don’t like the package manager).

In Fedora silverblue on KDE, all updates are handled through the discovery store which is similar and as easy as on windows.

Disagree. If you are suggesting not to theme and keep things close to stock (because you rightly mention that things break) under the guise of stability, why would you suggest that no one use an immutable distro? They’re way more unbreakable than your standard Ubuntu install.

“How do I convince my tech department to take on additional tech debt”