Because when I'm trying to close a deal with a customer, and I ask when they're free, I'll really impress them by saying, "oh, you're in UTC-5; we're in UTC-6"

Because when I'm trying to close a deal with a customer, and I ask when they're free, I'll really impress them by saying, "oh, you're in UTC-5; we're in UTC-6" How does the article referenced make anyone's life easier? It forces everyone into doing an equation instead of just one person (the host of the meeting)