I think there are two major hurdles keeping Linux adoption back (besides the obvious installation bit). The first is that our backwards compatibility is terrible. It is easier to get old versions of Windows software to run in Wine than it is to get some old Linux software to run natively.
If something like Photoshop did finally release a Linux version, even if they only did one release to make 2% of people happy, it likely wouldn't be able to run natively after 5 years.
The second is a good graphical toolkit. Yes, GTK and Qt exist, but neither are as simple as WinForms or SwiftUI/Aqua.