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Nobody says it anymore
(startrek.website)
I've heard it explained that "hey" used to be more of an urgent way to get someone's attention, rather than a casual "hello" like it is now, so it sounded rude to some older folks.
Y'all was different back then too. Now it's the most neutral greeting and that's really odd for my 90s brain.
I will die on the hill that "y'all" is a more concise way to convey the same information than any of the alternatives.
Tell that to every kid in Texas, that the teacher ever made write "yall is not a word" on the blackboard 100 times.