You do not need to do it in your "home country" at all, though, is the thing. People plan vacations around appointments they manage to land for this, in countries they want to go for their summer holidays.

Additionally, it doesn't really do that either, you don't need a valid visa (only valid status) if you don't plan to leave and re-enter US, so this mainly forces people to stay within US rather than going elsewhere for visiting family, vacation and whatnot. I'd not be surprised if the net effect was less time/money spent in "home country".