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The RPi is most certainly not "open hardware", it's even more closed than a standard PC. On the other hand, there are plenty of truly open ARM platforms out there, like the OLinuXino series:

https://www.olimex.com/Products/OLinuXino/open-source-hardwa...

That said, TempleOS on anything but standard PC hardware would be interesting to see.

I doubt whether OLinuXino's GPU is as open as RPi's VideoCore IV (among the GPUs used on ARM boards VideoCore IV (used on RPi) is the most open one - unluckily this is no praise for RPi :-( ), but convince me that I'm wrong.

That is an interesting idea. But even more so, I would certainly pay for a full MOOC on low-level OS development from scratch derived from it. Terry seems to have a rare and very useful skillset.

This is a great idea. I'd play with it on the Pi.

It would be a lot of work, but it's possible. I made it wed to x86_64.