Different teams with different goals. Shared engine logic + platform native UI is a strong approach to building cross-platform apps. You get to share code and

Different teams with different goals. Shared engine logic + platform native UI is a strong approach to building cross-platform apps. You get to share code and have performant native-feeling UIs. You still have to staff up your platform teams, though, and now you have the cross-language barrier to deal with in each code base, so each team needs expertise in that as well. Flutter lets you have just one team write one app, maybe with different themes per platform, but it's still all in the same language and runtime. The cost being that you get not-quite-native UI and performance, but maybe that's an OK trade-off.