After reading your comments, you made me think about it. I have never broken a piece assembled this way. I made a test piece from the 5/8" x 5/8" stringer scrap. I broke it by clamping about 5" of it to a table leaving 12" hanging off the edge.I then hung a bucket on the end and added weight it failed at about 27 lbs. The glue joint held 100%. The western red cedar failed. I repeated the same test with a virgin piece with same results.
I've been a wood worker for over 35 yrs.and only learned this method about 10 yrs. ago. With that said, what works for cabinetry doesn't mean it will work on a boat.