"a single world-wide time zone", Yes.

As someone who works with clients in different parts of the world I really do long for a single time zone that we can all share. In local life will 12 noon will always be the ~same time, but for business I don't care.

Usually I try to use UTC, but it's not always successful, and just trying to pin down a suitable time to speak to someone across timezones can be difficult.

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However, "replacing all writing with the international phonetic alphabet" is a terrible idea