I totally agree. The protocols feature of Swift is really cool and it’s great how simple it bridges default implementations and extension methods. C# 8.0 adds d

I totally agree. The protocols feature of Swift is really cool and it’s great how simple it bridges default implementations and extension methods. C# 8.0 adds default interfaces which are like protocols but they don’t work with older .NET Fx code. I’m working on a C# project right now where default interface implementations would save me thousands of lines of kludges with extension methods and duplicated class code. Sadly, it’s stuck on .NET 4.8 and can’t be migrated to .NET 6 right now.