Because cross-platform apps inevitably feel out of step with the OS they run on. Native apps can use system components and behaviors and will almost always run better because they don't need to be wrapped in a cross-platform framework. Admittedly a platform-locked app isn't going to be a universally perfect Lemmy app, but it can certainly be a platform-specific perfect Lemmy app.

With no disrespect to Voyager, its devs, or its users, this is why I can't use that app despite its impressive feature set and high level of polish--the ui feels fundamentally wrong on iOS, and the fact that it's a very direct Apollo clone but not written in native swift makes it feel like a knockoff.