I never wanted a long slide on a short grip. I don’t like guns that feel nose heavy and I don’t like the recoil impulse it provides in a 9mm. The sight radius argument on a self defense gun was weak to begin with and in the age of optics on handguns, it has become a moot point. Improvement in bullet technology has made the added velocity of a longer barrel less meaningful, as bullet expansion from shorter barrels has become more consistent. Just because it’s easy to conceal the barrel of a handgun, doesn’t make it any more comfortable with a longer slide, or mean I want to.
in 9mm, I very much prefer a G45 to a G49. The 9mm is a light recoiling caliber and I prefer guns with more weight toward the grip than the muzzle, as they seem to return more consistently back on target. Similarly, I like the G43X and wouldn’t mind a G26 slide on a G19 length grip. Aside from the color and the night sights, I like the 19X. I often carry AIWB, so the length of the grip has become less important when it comes to concealment. Frankly, the increase in the popularity of AIWB has probably contributed to the trend to higher capacity guns with shorter slides.