Wondering if anyone does a decent amount of android work in any tool and whether what I’m trying to do is going to run into issues at some later date
Basically I’m using a URI to access that dir to write a file there
Is this Kosher ? Stable ? Supported ?
Or am I going to regret this later on ?
It depends on the target version, Also if it is for the store or for internal use.
It is kosher (not pork meat 
) and it is allowed but only inside of the restrictions of Android File System. The API Release if the point to look for. Maybe this link helps you a bit.
It is always a mess while they change many stuffs between the API releases. Often not so clear to realize but… Have fun with Android building. One question: are you building with Kotlin or another solution?
I eventually found the right answer
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)