I have been doing loose m&t lately (no domino...yet) and I finally get why....This is going to make me sound stupid but it dawned on me this morning dry fitting the TV stand I am building. With m&t I was always doing little adjust the fit. With loose m&t it's a 'cut to fit' like pocket screws. as long as the edges are square, it's like putting a puzzle together with little to no adjustment. Funny how after all these years something you took for granted 'dawns' on you.