If your main goal is easy access to platform APIs, then I would probably stick with the native language/UI toolkits. Flutter is a UI framework; if you don’t car

If your main goal is easy access to platform APIs, then I would probably stick with the native language/UI toolkits. Flutter is a UI framework; if you don’t care about making cross-platform UIs then there’s no real reason to use it. If you’re mostly working with platform APIs, you’ll probably be using the native languages (Kotlin/Swift) anyway (unless someone’s already written a Flutter plugin, which often isn't the case).