We are currently looking at migrating existing Xamarin.Android and Xamarin.iOS applications to .NET 6 (we aren't at this stage going to use MAUI).
A big part of this process is understanding which NuGet packages we need to update or replace.
We're just trying to understand the difference between a package being compatible with a framework, and a framework being an additionally computed framework.
We can see for some of the packages we are using that net6.0-ios and net6.0-android are additionally computed frameworks rather than being compatible. What does this mean in terms of whether or not a net6.0-ios or net6.0-android app could consume the package?

NuGet Compatible vs Computed Framework (Xamarin and .NET 6)
It really depends.
Lets say you are trying to consume a package that only targets netstandard1.0 or above. That package will be totally fine to consume.
However, if you are attempting to consume a package that has multiple targets, lets say

netstandard1.0
Xamarin.iOS
monoandroid13.0

That package will only partially work. The netstandard stuff will definitely work. monoandroid13.0 will most likely work. However, since there are breaking changes between Xamarin.iOS and net6.0-ios then that part won't work.
Most preferably, for packages that target a specific platform, that should at least be net6.0-android or net6.0-ios, otherwise you will encounter issues.
