Well, trained by cops I am used to some variation of what they call 'Cruiser Ready' or 'Cruiser Safe.' Racking the slide is just natural to picking the thing up, at least to me. It would be weird to me and require re-training to use the safety instead of the slide.
That and shotguns aren't really drop safe. (Yes, I know it's highly unlikely that one would go off that they are engineered blah blah but.... see 0:38 https://youtu.be/Y9rU0tZwb6s )
With 8 shells in the tube and 6 more riding in a sidesaddle I'm not feeling like capacity is a big issue for home defense.