Y'know, every time I read "Glock Carbine," it gets filed into the same internet nook in my brain that keeps "Gecko45" posts. But you're absolutely right. If nothing else, Ruger has made the point.
Craig Douglas and I briefly discussed the 42/43 conundrum at his course a couple of years ago (I was using a G43 for the class). We both agreed that the 42 was a sweeter shooter. Honestly, a real case can be made for a G43 as a "one gun to do it all," if it's going to be the only pistol, but if two pieces of plastic are doable, splitting around it with the 42 and a G26 or similar makes more sense to me. OMMV.