Anyway, China manages somehow. I obviously think keeping our time zones and moving them to standard time (noon ~= actual noon) would be best, I was just offering a farcical alternative that would be better than permanent DST.
The point of the article is that timezones solve practical problems that will keep existing if you remove timezones - no matter if you do it globally or only in one large geographic region.
People have a use for a time grid that is relative to when they're awake, and the article I linked to goes into great detail why. Don't worry about telephones, people can still interact without them.
(For the curious, Chinese businesses just adjust their actual working hours locally, it’s not really an issue.)