Many things are holding Linux on the Desktop, but its more so that the competition is doing better and the Desktop market shifted

First, Windows caught up, Linux used to have things that windows didnt in the late 90s and early 2000s, not most linux only app have windows ports, you can run any linux app on windows WSL , and now windows also have powershell

Second, apple made a comeback, now many people who dont want windows use apple and get a unix experience if they wanted one

Third, end users shifted to tablets and mobile phone

The combination of all 3, leave little room for linux, no matter how good linux does , linux on the desktop only make sense for people who develop for linux on the server and want a similar environment on their laptop