Most Cmdrs don’t have their power priorities set properly. It’s not one of main topics discussed in forums. It’s mentioned a few times until one of these videos surfaces.
You're correct! I'm amazed at the sheer numbers of CMDRs flying without properly set power priorities. It's one thing for a new player that doesn't know any better, and quite another for experienced veterans of the game, specially those that call themselves "PvPrs". Without mentioning any names, I recently watched a stream video of a self proclaimed "Ganker" that got killed in Deciat after his mamba shields went down, with a quick hit to his power plant that damaged it below 80%, and his thrusters stopped working. It was obvious he had no power priorities set, and fittingly became a sitting duck.