> If we lost the knowledge of how to tech how the ARM architecture works, as was the case prior to the raspberry pi but after the death of the Acorn line of RISC PCs, we would have lost quite a bit of important knowledge.
In which universe did that ever happen? ARM was alive and kicking to the point that even Intel had its own ARM designs. Heck, I worked with ARM-powered devices 20 years ago and those were far from being "lost knowledge".
Just because something isn't being hyped to edge of the solar system at a given point in time, doesn't mean it's dead or forgotten...