[jpalawaga]

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.