That's an interesting way to go about it. I like the solidness of the whole assembly, that way. Yes, screws would be way better for that, staples just won't pull a joint closed. They hit so quick, with no mass to exert on the gap. They will actually hold a joint apart, rather than close it up.
Roo Glue is some fantastic stuff. It sticks like crazy, to the point of causing damage if you need it back apart. It's funny stuff though. It is thicker than yellow glue as far as runny, but then when you touch it? Like nothing is there. It feels more like hand lotion than glue.
We do a 45 degree panel across the back of corner cabinets, just to stay away from the sharp corner. The walls are never square, so this keeps from having a point back there in the taped joint of the drywall.
It would add an additional tool change, but you wouldn't believe how much faster the machine can run if you do the perimeter cut-out with a 3/8" bit, assuming it has the power to increase the feed rate that much?
The company where I work, stepped up to a full-sized (5 x 12) CNC machine, from the old point-to- point machine, right after I started there. (18 years ago) They ran it for years with 1/4" bits for the cut-out. The move to 3/8" was huge. That thing moves at a pace that is simply amazing. Of course, this is in an industrial shop where speed is king, making hundreds of parts.