The "web operating systems" in this post and "the browser as an operating system" are two different ideas. These web operating systems are essentially a Desktop Environment within a browser window.
Why would I need a Desktop Environment (a la KDE, Gnome) in a browser? What itch does this scratch?
I've thought that it would be useful quite a few times, because it avoids syncing.
Sync is an issue that causes pain for a lot of people- Microsoft has been trying to fix it since the mid 90s, and Dropbox et all do it well.
So I'm at work, with my email client open, and I've got a list of RSS feeds.. I want to check the same list of RSS feeds at home.
I also want my email to all be synced properly, even the ones from that old POP3 server that doesn't support IMAP.
I want my bookmarks, and browser history to sync, as well as my saved passwords.
I want to pause the song I'm listening to in my office, hop in my car, and press Play again, then finish the playlist at home on my stereo.
All of these things have solutions now.. Dropbox, Weave, IMAP, etc.. But they're all disparate solutions. I'd pay money to have one solution that just worked. That let me keep my workflow online, rather than having to break it up.
Something that synced everything, rather than each piece.
One of the best ways to do that is an OS where it all lives remotely. That way, there's no "sync" involved. It's all out on remote servers to begin with.
I use a combination of web-based applications, a ssh client, a collection of portable apps on a usb drive (including firefox from portableapps.com) and an iPod. It all works completely seamlessly without the need for a "Desktop Environment" in the browser.
I'm still at a loss as to what bringing a Desktop Environment to the web brings you. I understand the need for web apps, not the Desktop Environment.
(Also, can't you easily setup this for yourself and run existing desktop apps using VLC? Rather than just using half-baked apps that the WebOS devs have created?
I often do use Remote Desktop or NoMachines, but most users aren't going to do that. If you could make setting up Remote Desktop/NX sessions trivial, you'd obliterate the use-case for web-desktops entirely.
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