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You're right, it is social conditioning; like a warm December in Australia.

A mid-morning switch of date would take a bit more getting used to, but yeah, the time alignment isn't that weird considering we already handle quirks like some cultures having mid afternoon naps

I think switching days in the middle of the workday is the single biggest good argument for time zones. When lunch is is something you’d get used to quick. Having it be Monday before lunch and Tuesday after would be a head F*. It would also screw with date calculations in a big way.

Having the whole of North America on one big time zone would be fairly easy. This is basically what China does.

If you grew up with 3am being lunch time it won't feel awkward, until of course you move somewhere where 3am is sleep time and then it's awkward again.