When Microsoft first pitched the “one .NET” vision for .NET 5 last year, they made it sound like they would be incorporating features from Mono (like AOT compil

When Microsoft first pitched the “one .NET” vision for .NET 5 last year, they made it sound like they would be incorporating features from Mono (like AOT compilation) into the .NET Core CLR so that the new runtime (.NET 5) would be used everywhere: https://devblogs.microsoft.com/dotnet/introducing-net-5/ https://devblogs.microsoft.com/dotnet/introducing-net-5/ However, their announcements from Build (and this blog post) have made it clear that there will still be two different runtimes (Mono and the .NET 5 CLR) with different strengths and features, and that they will just share the same BCL. Although I can can understand the rationale for keeping multiple runtimes (creating a single runtime that does all things well would be difficult and take a lot of work), the change in vision is disappointing.