Not sure if you are arguing for or against time zones. Here's my two cents.

I work with a team spread over 11 time zones and talk to them constantly on Slack and email. Time zone math is simple: just add or subtract the offset to see if it's a good time to ping them. I know where people are already. Hard to see a problem with this.

The one thing that's really confusing is daylight savings time. That is a mess and should be eliminated, because every major region does it differently. It's a mess even within regions like the US, where the word "capricious" comes lightly to mind.