Sharing isn't such a hassle when each guest is assured their very own Kit Kats with their slice of cake. No fighting, except maybe over the spilled m&ms skittering off the table.
The best thing about these cookies to me is the fact that they didn't turn over all the M&Ms to make them plain red. I see this as a sign of smart priorities. Just jam the chocolates on there as fast as you can because the sooner they're done, the sooner we can eat them!