I don't see how the question is relevant. I'm generally not communicating with collections of longitudes. I'm communicating with people. They can tell me what their working hours are.

The point is that they already have to, since working hours are, in fact, not identical between neither regions nor people within a region.

That said, I'm not saying that we should abolish time zones. I'm just saying that that article is stupid and fighting a straw man.