That hasn't been my experience. With a home office, it's hard to tear myself away from work. Commuting is a waste of my time, and a "clean break" ends up costing my employer several hours a day. I'm salaried, so that isn't a monetary cost, but I've seen a real benefit to productivity.

Of course, employers want both butt-in-chair metrics and 24/7 availability without increasing pay. Don't give them that.