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What do you mean by polarity issues? AFAIK alternating currents don’t have a polarity.
That’s not quite how AC outlets work. Line and neutral can intentionally have different potentials relative to ground depending on how the house’s electrical system is designed. This can become relevant in certain situations like very simple devices (think “lamp socket with a power plug”).
A plug that can’t be inverted makes this a non-issue.
(Edit: Added missing “not”.)
Orientation of hot vs neutral