I want a single part file.
It seems like an arbitrary decision to leave out those settings, making it a pain to do with a separate part. Instead of a simple sketch and extrude cut, you have to make a separate "solid" part that represents the "hole" that you want to cut. Since it's a completely separate part, you don't get the benefits of "to next" or "geometry" with a simple extrude cut. You have to shape the "cut" part exactly the way you need it for the boolean subtract.
That's a lot more work for what could be a simple step.