Yes, I know. And now if you want to know when to schedule a meeting with someone far away, you have to consider that where you are, working hours are 22:00 to 06:00, and where they are working hours are 13:00 to 21:00. Knowing that is just a different way of having timezones.
Timezones are only annoying when they change, or when you have to do things that cross between them. If you want to get rid of them, you need a way to solve the problem that timezones solve, ideally without having the same problem but with more steps.