Simple. The butt hurt is because there is a truly massive amount of ignorant derp associated with the 1911, both pro and con.
The G17/19 is a great idea. It's super cheap, super simple, super light, and super reliable. It would easily be my first choice if picking a 9mm to be issued based on those qualities.
Now to more directly speak to the 1911 butt hurt individuals. People want reassurance they are picking the right gun. When one unit or another moves away from them, it makes them question their choice. Simple as that.
In spite of the "experts" the 1911 suffers from few shortcomings:
1. It will never, ever, ever be as cheap as a nylon framed, injection molded soulless plastic gun. It just wont.
2. It carries half the bbs as a double column 9mm.
Those are the big ones. They aren't difficult to maintain. They don't need depot level rebuild every 5k. They don't need hand fit parts anymore than a Glock. They don't rely on black magic to run. You don't need to baby them. They don't need to be cleaned constantly. They are super easy to shoot well. They aren't difficult to reload. Extractors don't need to be replaced every 7.5k. The M45 wasn't the spectacular failure or boondoggle as oft reported (yes, I read the report. Multiple times. I even talked to the people actually involved). It is one of the most, if not the most, reliable 45s made. It does not have a torturous feed path. The slide and frame don't wear out in 50k. 500k, maybe. They aren't anymore lubricant intensive than any other "full frame rail" design. The problem is the current "experts" have no idea as to what they are talking about. If they did, they'd be talking about the case rim, not about blind parts swapping. They'd be talking about Devel's radiused feed ramp geometry, not how polished the ramp can be made.
Most of the 1911 fanboys today have no idea, and they are looking for reassurance. So they band together when they feel their decision might not be the best. They quickly ignore the many advantages of the design.