I just realized maybe op was thinking about .NET release notes? They are lengthier. https://docs.microsoft.com/en-us/dotnet/framework/whats-new

But .NET is a framework that is written in C# and extensively used by C# and not a language.

Agree. I have some beefs with the fragmentation of the framework though. I kind of hope that in the end we will end up with only two frameworks: mono on wasm for clients, and .net core for server/high performance clients.

But what is true is that there starts to be a lot of overlap and inconsistencies between multiple generations of the framework. You have object methods vs generics. You have async/callback methods vs async/await. You have ref/out returning methods vs valuetuple returning functions. etc. The language is starting to show its age even though the .net team has been adding to the syntax sparingly.