[leeter]

> but practically useable operating systems in the traditional sense of abstracting away real hardware can still be counted on one hand.

I think this is telling. There are plenty of 'standards' for interfaces in the hardware world. Some (mostly USB) are even 'followed', but the realities of hardware are that it never behaves nominally. So without someone willing to spend the time writing code to handle the quirks that can't be patched out and the errata it's very hard to run on physical hardware with any performance or support.