Same concept as, if one guy living in a formerly industrial loft has water cooling, and 300 amp 3 phase power available, that does NOT make any computer requiring that "personal". For that I'd say must be able to plug into 50% of all homes, but realize more quibbling might apply there, such as 90% of all "middle class" homes.
For me to have a computer, means taking it 3 flights of stairs. Thus most vintage computers, I don't even think about them.
