I guess it's just a difference in opinion. Spawn-Inc answered again as well, and yes, letting yourself load a primed case could lead you to accidentally load a loaded shell, although its a slim chance. The OP said he pulled the bullet and dumped the powder, but didn't measure it. I would not want to re-test the primer in my house, and find out too late that there was some powder left in the case, that was maybe packed in. A primer has enough power to push a piece of debris, or any other item out the barrel at very high speed. All reason's enough in my house not to fire a primer in the house.
When I was a kid, my dad made me a "pellet gun" with his 223, loaded with a magnum primer, and a 22 cal pellet pushed into the mouth of the case. I don't know what velocity they were going, but it would kill birds as quick as any other pellet gun. To me, and everyone may be different, a primed case is treated just as a loaded round. I don't chamber either inside my house.
Each to your own.