When notching a structural member against another structural member you essentially get an extrusion of the second shapes profile. The problem is, if you're going to start making part drawings, you'll be showing all these wonky edge protrusions created from the radius edges of the trim profile as seen in the first image. Odds are this will be cut on a nibbler or band saw and it will look much closer to the second image. I'd like to see this tool revised or a supplementary tool added to created trimmed members as they would be made in production.
Our fab shop will receive a weldment assembly drawing with a note "cope as req'd" on the angles and I don't need to go into this much detail...but on occasion we've sent out large batches angles/tube to be cut and I'd have to go through creating multiple extra extrusions at each end (or mirroring one end) to make sure we don't have problems.
Bottom line a notched angle would not look like the Inventor tool notches them.