It doesn’t matter how little money I’ve spent on apps. I just don’t want to learn a new thing if I switch. So I don’t see the sunk cost fallacy as applicable here.
Because that’s time not being spent on art. And if either works as well as the other, then there’s no real reason to want to switch, apart from bizarre arguments about alled gardens being a reduction in freedom and jailbreaks which look more like obnoxious hassles.