There are lots of indie/hobbyist OSes, but they rarely contain striking interface ideas. One theory: it's a money-hole, so authors are mostly solo; a solo eng can ship an OS but usually can't design good novel UIs; a solo designer can't ship an OS; a collab will be ^2 rare. But:
Conversation
Do you mean OSes only or also window managers and desktop environments?
I’d imagine people who want to innovate on the UI side usually don’t feel like writing pages and pages of kernel code in a systems language.
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