That's a very poor joint that I would never recommend. Too much end grain to end grain.

Also, cutting joints like that with a router in solid woods is always problematic, as the wood will tend to chip where the bit exits the cut.
That's also an issue in the wood joints you PM'd me about. Cutting a lot of those joints in solid wood is very difficult, unless you are starting with an oversized stock in both length and width, to allow trimming off the chipped edges.