Why do you think backwards compatibility dropped? Just recently they decided to not build newer versions of .NET Framework on top of .NET Core (even though they

Why do you think backwards compatibility dropped? Just recently they decided to not build newer versions of .NET Framework on top of .NET Core (even though they have open sourced practically everything on .NET) to ensure that older programs built on .NET Framework will keep working and wont face issues from any incompatibility with .NET Core. IMO they are making their life a lot harder by introducing all those frameworks and platforms every five years or so, but despite that they still make sure that stuff keeps working.