As a reference, Spain has been in the wrong time zone for decades (GMT+1 instead of GMT) but they have no problems with that.
In Spain the real problem is the brain dead broken hours with a huge gap in the middle for "lunch". That's a relic from the time after the war when most people had two jobs and some companies are very reluctant to change it because of the butt-time mindset or other idiotic reasons.
The sun reaches its highest point at a time sufficiently far from 12:00.
> the whole world could just use UTC and nothing would happen.
That is not true. What would happen is that times would lose all intrinsic meaning. When you schedule an international call, people can say "that's 5 o'clock in the morning for us". If the whole word were to use UTC, you would loose that, and we would have to invent a new way to say that. You know – some kind of "localized time" :).
That's answering by reformulating the question. Now I would ask why is having the noon "sufficiently far" from 12:00 wrong.
What would happen is that times would lose all intrinsic meaning.
You did it again.
When you schedule an international call, people can say "that's 5 o'clock in the morning for us". If the whole word were to use UTC, you would loose that, and we would have to invent a new way to say that. You know – some kind of "localized time" :).
Is scheduling internation calls really the biggest problem that would arise? Good.
Anyway, you would say: "we are available from 22:00 to 4:00" and that is all. The way to say what time of the day is already exists: morning, afternoon...
>> The sun reaches its highest point at a time sufficiently far from 12:00.
> That's answering by reformulating the question. Now I would ask why is having the noon "sufficiently far" from 12:00 wrong.
No, that's you moving the goalpost. I answered your question.
>>> nothing would happen.
>> What would happen is that times would lose all intrinsic meaning.
> You did it again.
I did what again? I explained how "nothing" is not what would happen.
> Is scheduling internation calls really the biggest problem that would arise? Good.
This might seem lazy, but I discovered in another answer here that somebody made this point already way better than I ever could: https://qntm.org/abolish.
Anything that is difficult right now due to time zones will stay difficult. It is difficult because of humans and their desire for daylight. You always need two time systems: One that represents local usage of time and one mostly for machines. We already have that.
It's also odd getting up at 7am here and it's still pretty darkish in August.
Only that their lifestyle is approximateley 1 hour shifted. Stuff like eating at 21:00 or 22:00.