[apitman]

SAF is a terrible solution for anyone trying to make a cross-platform app (and if you're not then why are you targeting Android as your one platform?), because it doesn't work with native code.

[pjmlp]

JNI exists, and poor fellows having to write a bit of Kotlin or Java.

[apitman]

The problem isn't the language, it's that the API completely changes the paradigm of how you access the filesystem.