Comment by Rohansi

> Microsoft actually bothered with ECMA during the early days, however it hasn't been updated since C# 7.3, .NET Framework 4.8.

I know it's not a popular opinion but I don't see why they should bother. There are already multiple implementations that serve different use cases, but they are slowly converging into one. There are more languages+runtimes which do not have formal specifications than those that do, and that's okay! Fragmentation is not a good thing.