that's the beauty of (something)
That's the benefit or positive effect of something; that is what's appealing or satisfying about something. A: "I'm feeling a lot better after taking those few days off." B: "Well, that's the beauty of getting the rest that you need." That's the beauty of games like these—you can play them anywhere, anytime, with anyone.
that's the beauty of
This is the most satisfactory feature of, as in And our vacations fall at the same time; that's the beauty of working in different law practices . [Mid-1700s]