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I also only use the S variant in human conversation in my time zone.

I assure you that I am human and never, ever, write EDT in a conversation. My phone even tries to autocorrect it to EST

This is why I generally try to avoid it and just call it “Eastern“ or “Eastern US“ if talking with someone who might not be in the US.

Which is annoying.

Then you should change your behavior, because probably one day you will talk to someone in Arizona