Probably because people can appendix carry (comfortably) or pocket carry those pistols (the 43, Shield etc) and/or because they're
so light.
On the G43X it has a longer grip. While appendix carry will be possible you can forget about pocket carry. Height including mag are the same as a Glock 19. It's just thinner.
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Then the G19
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Glock kind of brings it on themselves to some degree. They simply don't listen to the people who buy their guns.
Are there a certain amount of people who are going to bitch and gripe no matter what? Sure. Some of these complaints are legitimate.
They could have gotten on board and designed a PCC in the late 90's and early oughts when police depts we're asking for them. Instead Ruger tried to step up to the plate, it's just that most cops weren't/aren't carrying Rugers.
It took them forever to some up with a Shield or PPS size 9mm.
Missed opportunities.