> most runtime improvements benefit all languages that target it And most CIL ABI additions to the CLR driven by C# totally break them, because the C# ecosyste

> most runtime improvements benefit all languages that target it And most CIL ABI additions to the CLR driven by C# totally break them, because the C# ecosystem adopts them immediately (recently even breaking changes in the shared framework!), and there's no modern equivalent to the Common Language Specification. Plus, no library writer would care if there was a CLS 2.0 because every CLR language other than C# and F# is in maintenance mode or simply abandoned.