In some areas, standard workdays would span "days". So e.g. a business would need to post its hours as "M-F, 00:00 - 1:00, 17:00 - 24:00". (actually it's even worse as the last 00:00 - 1:00 is on a Saturday)
Or imagine chatting with a friend at 23:00 about plans after you get off work at 1:00 the following "day". "See you tomorrow?"
Or do you reserve "tomorrow" for telling someone at 8:00 that you'll get back to them when you wake up at 16:00 that same "day"?
Today people only have to deal with this when communicating with people many time zones away, but now it's an issue even within a single area!
If we abolished time zones, it wouldn't make sense /ever/ for people in some parts of the world, even when communicating with people close to them. That's worse.
Or imagine chatting with a friend at 23:00 about plans after you get off work at 1:00 the following "day". "See you tomorrow?"
Or do you reserve "tomorrow" for telling someone at 8:00 that you'll get back to them when you wake up at 16:00 that same "day"?
Today people only have to deal with this when communicating with people many time zones away, but now it's an issue even within a single area!