Read somewhere that it is relatively easy to adapt NetBSD's drivers into a custom kernel... maybe Serenity folks can go that way? Device drivers are huge obstacle for any fledgling OS.
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It's basically what Apple does and has done from the start as far as I can tell. The only breakthrough consumer Unix-like thing out there.
System76 is another example of (almost) that.
Frame.work comes close although they don't focus on the OS as much.