Ok, fine. PLATO was a super cool more generalist machine that happens to not be a personal computer. My use of personal computers was just an example that I thought would get a point across about the evolution of technology. The fact that PLATO existed and was very different than what came before it (as per all the cool stuff you listed) if anything strengthens the argument I was making. Generalist machines were a big step up from what came before, orders of magnitude better. A super-AI will also be unpredictably orders of magnitude better than what we've done so far.