Prolly mostly a learning curve. I largely want to de-Google and reduce tracking, but I'm not rigorous about it yet. Open source maps function quite differently from the goog, and so as I learn how to use them, I'm still falling back on web-based Google maps.
I keep my old phone around to fall back on when I discover some rarely used app, then try to find a less intrusive alternative to install on graphene.
Here's a helpful site...