Polarized is to have correct hot and neutral connected in a device, but on a consumer devices, there is no ground connection on hot side so polarity does not matter since the device usually have a transformer built in which is part of safety isolation to break the hot side from cold side and does not discriminates polarity due to transformer that power its doesn't know the polarity because of electrical design in consumer device does not know which polarity is. The neutral is tied at one place at fuse panel to ground, no else by electrical code.
Remember sine wave power have no polarity if there is a electrical isolation via transformer. Stoves, strip heaters, and dryers use 115V to 115v 180 degrees apart to create two phase 220V.
Secondly, most of consumer and stuff that does not have isolation internally,is all hot, used polarized plug for bit more safety nowdays (nuts!) and in the old days, the two prong plugs was nonpolarized on a all hot devices too, ie: metal fan, old vacuum cleaners etc.
Reason the computers that is made of metal needed grounded 3 pin plug for extra safety by code and help with EMI noise return. And there is exceptions on external power supplies still provides isolation via power supply's transformer in it yet there is some that has a ground pin in the input AC plug too, there is no rhyme to it. Also, if a metal computer is powered by external power supply, still don't require ground either but some better quality one have 3 pin input power supply that provides ground for better noise return.
Use non polarized connector anyway unless there is a oddball that *requires* polarized plug for best audio quality but that's extremely rare. Even the midi devices used jellybean external AC tranformer to step down to lower either isolated AC or isolated with no ground, DC output.
Even xbox one S, Series S/X and all models PS4 except some PS4 Pro (kettle plug), and PS5 used non polarized plug figure 8 connector.
Cheers,
Great Northern aka Canada.
