Now that I can have everything out-of-band I like the dotnet core tooling a bit more.
But it looks like we're not there for everything yet - funny in a way, since now, even though in this project everything is Microsoft, I still have to integrate differrent toolchains.
So, the newest problem on the block: Xamarin Android projects cannot be restored with
The relevant bug entry is at the time of writing still open and not adressed in VS2019.
So, we fall back to msbuild with
msbuild /t:restore AndroidApp.csproj