Props to OP for using the term 'superstitions'. Wi-fi (and radio in general) is poorly understood even by people with engineering degrees, let alone the average Joe. This often leads to trying random stuff until an improvement is perceived (or believed to be...), then spreading this experience as proven and applicable in any context with no further research and confirmation of the results (let alone filing bug reports).

The prominence and accessibility (to laymen) of wifi does not help the situation either... I mean what else CAN they do except try stuff out, how are they going to determine that it worked and why it did?...

OP, yes, poorly implemented power saving has in my experience often been a culprit behind network reliability issues. That said, please consider adding a disclaimer that just disabling power saving in client devices without pinpointing the root cause of the instability or at least reporting it is exactly why we are in a situation where it is still buggy.