USB served its intended purpose extremely well, being maliciously complex is a feature. The goal first and foremost was to put the PC at the center of the futu

USB served its intended purpose extremely well, being maliciously complex is a feature. The goal first and foremost was to put the PC at the center of the future digital world, to avoid a timeline where FireWire or something like FireWire linked our devices together w/o a PC as an intermediary. I would love a protocol you outline, but could you use SPI as the physical layer and put the rest on top?