Multiple calibers out of a handgun isn't anything new to the gun world.
Also, about .38 Super... What's the point? It definitely served its purpose and did it well (talking pre-.357mag days here), but modern technology has caught up to it. You can get the same velocity and energy out of a hot 9mm as you can from an average .38 Super, and you can get it in a cheaper, more readily available, and smaller package.
Well look at that, you asked for it and now you've got not one but TWO of your own quotes
See now that's a perfectly fine reason to want a .38 Super, or a .22TCM, or a handgun in a "rifle caliber." You asked for practical, logical reasons that people don't like them, and those are the answers you got.
I would love to have an Anzio 20mm rifle, though it serves absolutely no practical purpose for me. I recognize and accept that, I don't try to justify it with reasoning... I simply want one just because I want one.
Were did I say you did not know what you were talking about. And do you really not think a 45 will do that.