I find these web desktop idea interesting but a solution looking for a problem. Part of me wants to post the Batman slapping Robin meme with Robin saying "Maybe I should develop a web desktop that runs in the browser"
At least for me as someone who made one, the inspiration was seeing really well done ones like OS.js or Windows 96 that got me thinking it was "possible" to make something realistic. But the core idea was less about making a desktop environment and more about my personal website being like someone RDP'd into my machine and could see all my stuff.
I know a couple people who have made their own versions with just that reason.