He makes some good points and does a fine job of discussing joinery. Don’t know about the “cauterizing” thing. Might have to get Mathias Wandel to do some independent testing.
He also didn’t discuss the strength of finger joints when using solid wood rather than plywood. These hold up better than plywood even laser cut.
It is a good point to make. For boxes that will have a lot of diagonal stresses or twist, the typical finger joint isn’t going to deal with those stess completely.
Would be interesting to test a box made with two layers of finger joints, but with fingers offset in the layers to overlap differently. Of course you are going to have a stronger box with another layer over it. Come up with a design that uses one layer that is just as strong. Now that would be some cool engineering.
Oh yes, and don’t in my sandbox! I’m playing in it and I kind of like it this way.