These are only obvious if you never move outside of a few select zones. Time on the wall still being somewhat related to the sun doesn't even apply to countries with strong summer/winter variations. That's part of why killing DST has gained much more popularity in recent years.
I think it's clinging to something that was an approximation in the best case scenario, and appears to be pure fantasy the more we dig into it and look around.
People think in different ways and have different levels of education. We would never learn if we weren't allowed to ask silly questions. It is very important not to discourage people from asking them.
Don't trivialize the other posters reasonable comment.
These things only become apparent with international travel or communication, which 99% of the world does not do on a regular basis. Even with the other comment making sense in it's points, I still disagree with it. So don't disparage that other user for having an idea with serious merit that only has some subjective drawbacks.
It's possible I'm being unreasonable, but I do not think it's a reasonable starting point for any discussion to open with "I never understood X, so why should we not delete X?" Like, is it not reasonable to educate yourself before asking strangers to educate you?
Timezones have existed for nearly 200 years, before international travel or distance communication was commonplace, so I implore you to explore even the assertion that those are pre-requesities for understanding why timezones might be useful.
> having an idea with serious merit that only has some subjective drawbacks.
Abolishing local solar-approximate time is an idiotic idea with multiple objective drawbacks, not to mention that it would be massively unpopular. IF you think it's a reasonable idea, you really haven't thought it through, and you absolutely do not understand how time has meaning to people, and how our entire societies are built on shared collective ideas of what different times of the day mean to us.
The level of stupidity of the idea is on par with "hurr durr, why don't we get rid of our nuclear waste by shooting it into the sun in a rocket?"
I think it's clinging to something that was an approximation in the best case scenario, and appears to be pure fantasy the more we dig into it and look around.