Looks totally stupid in my opinion... After an eight-hour flight, if you went to bed at 21:00 yesterday, you’ll do the same today. This will not work exce

Looks totally stupid in my opinion... After an eight-hour flight, if you went to bed at 21:00 yesterday, you’ll do the same today. This will not work except if you are completely shifted with the local time when you travel. If you change of timezones, the sun will not raise and go down at the same time in UTC obviously. So you will go to sleep in the middle of the day. Also, when you are at home, everything will be in local time anyway, you will not see the difference, and going abroad you will constantly have to do conversion in your mind from local time to UTC otherwise you will not know when shop open and close, the train will leave, ... You can complain and work on improving a tool that will covert badly, but for me it is kind of transparent with recent technology. Phone and watch update themselves automatically when you leave an airplane in a different time zone country and most tools look at your location to show you relevant time. If you say that it will make it more convenient to work with people in other timezones, that's not even the case, because UTC will not tell you if a time is a good time or not regarding local time. So someone giving you his country/timezones is enough for you to select a right time. Let's imagine I'm working with you that is located a quarter of the world away, how do I know in UTC what time is the work day morning proper time for a meeting? 11h UTC? 22h UTC? 4h UTC?