MacOS World Clock Design Flaw

The map is a representation of day/night, not time zones. That you find no use in that is interesting biography, but it does not mean that Apple set design over function. The app does what it is designed to do. Time zones you get below. If that does not meet your needs then you should get another clock that does.

Since this community is a user to user forum, you'd be better served by submitting your concern to submit bugs or feature requests here:

Feedback - MacBook Pro - Apple

Feel free to send Apple feedback.

Feedback - macOS - Apple

As the lines shown are Lines of Longitude, you are correct, they do not represent time zones. Specifically, the lines shown are Lines of Longitude at 30º spacing.

brunman wrote:

yep exactly, what does that do for a traveller?

Personally, I see absolutely no benefit to be had over what is already there. Cities times based on their time zone.

You might want to take a look at this article and see why drawing times zones is not very practical on a small map.

https://www.timeanddate.com/time/current-number-time-zones.html