Why don't people just do this then? There's no overwhelming obligation on individuals to use the local timezone.
I also think that your using the example of submarines -- notoriously an onerous lifestyle that very few are capable of living -- pretty much torpedoes your implicit suggestion that this would not be too much of a change.
The reason it is hard being on a submarine isn’t because of the clock. That’s like saying that it is hard to be a construction worker because the hard hats aren’t fashionable.
And the reason why people don’t just do that is because it is a network effect problem. We all need to buy into it. Like the metric system or driving on the same side of the road.
And people do this. Haven’t you seen people who routinely talk to people outside their timezones sign their email with their location and/or UTC work hours?
I also think that your using the example of submarines -- notoriously an onerous lifestyle that very few are capable of living -- pretty much torpedoes your implicit suggestion that this would not be too much of a change.