Most anything you'd be spraying inside the home will be a flat surface, as in a wall. Unless you are perfect , it's going to look like ****. Takes a lot of practice to do it, and you don't get a second chance with paint. If I'm spraying lacquer, I can wipe off my mistake with thinner and re-shoot it. You can't really do that with a bedroom wall.
Not saying it's not possible, but its taken me years to be able to do it, and I still screw it up once in a while. Lot quicker for me 95% of the time to whip out a 4" brush and 18" roller.