>Would be great if something grew from hobbyist / enthusiasts.

Making PCBs to support modern x86 and even high-end ARM CPUs with DDR5 RAM and also PCI-express is beyond the skillset of a vast majority of hobbyist and enthusiasts. It gets so so far up the creek of high frequency signal engineering under electrical engineering. It's not impossible, just very time consuming and costly (between equipment required for testing and PCB manufacturing).

But yea all the other stuff in a framework could get hobbyists and enthusiasts making their own elements like the expansion cards and keyboard significantly more easily if there was a need for it.