Why is Maui, Kaanapali Hawaii no longer on Apple world clock?

We are all users like you on this user to user only forum. We can't answer why anything questions here. I know that NOT all cities are selectable in the world clock. I live in Tampa, FL., a much larger metro area than Maui and it's not an option on the World Clock either. But then, it's never been an option. I just choose another city, which is in the same time zone and I suspect most others do the same. I imagine you can find a World Clock app in the App Store, which may show more options than the Apple provided app.

Apple usually gets the “why?” questions, not us.

Nobody here knows the answers to many of the “why?” questions involving Apple.

You can ask that those locations be re-added: Product Feedback - Apple