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So I went to buy a Glock 43 and left thinking what the fuck is that abomination. It's almost the same physically (excluding the thickness) as a Glock 26. Not sure what roll this gun even fills and I'm a Glock fan, leaning towards a Glock 42 at this point, bash away.
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It fills the role of being a bit easier to conceal than a G26, especially in a pocket or when you're wearing a nicely tailored suit.
It is a niche gun to be certain...but a lot of people have that niche.
Like you I'm more inclined to go to a .380 in that size range, but not the G42. I own one and I've shot it quite a bit but I just cannot hit with the G42 at speed to my satisfaction because of the amount of lateral push I get when I try to shoot it with any speed.
I greatly prefer the Sig P238. I bought one for my mother and it's a superb little handgun. The 938 intrigues me but it seems pretty iffy on the reliability front, at least as far as I can tell.