Idk man I can justify it pretty easily when you realize I'm only worried Abt decepticonsI can see the 9 vs 45 analogy to 5.7 vs 9 and 5.7 being adequate with proper loads... that cost dollars per round and have to be ordered.
Almost zero mechanical accuracy difference at ranges shooting someone is justified. Statistically, 17 rounds vs 20 rounds is irrelevant since the vast majority of SD action doesn't use half that. Plus, as mentioned and as the saying goes, every bullet comes with a lawyer. That's also assuming it doesn't take those extra 3 rounds to stop the perp because you didn't buy the dollars-per-round fancy ammo.
I get it, it's a cool gun and round but you're building a roundabout straw man case to justify it.