https://marble.kde.org/ has had their own implementation of a streaming vectorOSM layer for nine years and I was eagerly waiting for something akin to materialize in other OSM map applications for quite a while.. Downloading hundreds of megs of map data in big whole-country chunks always was a space issue in android OSM apps. Very glad a standard is finally being established and looking forward to it getting picked up and polished.. Great work! : )

I went looking for the Marble app on Android and it's not in the Play store or on f-droid. The link to the Play store from the website is a 404. Did they abandon it?