One more for the saw slot first. One of the issues with type bit is that it has a hard time getting rid of the chips so lots of them get recycled in the cut and generate a lot of heat. The saw slot will also give it air to cool itself with. I worked at a place once that used a proprietary bit to fit a plastic clip into for attaching kick boards. The saw slot extended the life of the bit times 3.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.