the lesson is supercomputers are so cheap they can be embedded anywhere
Exactly. An informative comparison can be made with the development of power tools.
Once upon a time, power tools were relatively expensive, so everyone would buy a single power unit (the drill) and several attachments that could be powered from the drill. Then people realised that they were wasting a lot of time switching attachments so they started to buy self-powered tools instead. Economies of scale brought the cost of the power unit down, and that accelerated the process.