I'm back in the job market and it doesn't even seem like HR has a clue what programmers do. My favorite was: "Must be fluent in: C#, .NET, and .NET Framework..."
The best I've seen is (verbatim) "Excellent Javascript(ES6) and CSS skills with minimum 10 years of Java (enterprise) for services/apis development experience, 5 years experience in ReactJS/redux or similar, 5 years nodejs"
I've found that the understood meaning of .NET has changed from when the term was first defined by Microsoft. Originally it meant the C# language and the multi-language library that it employed. Now it means specifically the parts of that library that are used for server applications.
Eh, I hear people talk about .NET desktop apps all the time and they are understood quite well. .NET (and, frankly, everything that isn't HTML/CSS/JS) may be less used outside of backend use than was once the case, but I don't think .NET is conventionally understood to be backend-specific in any general sense.
Perhaps that's still true in casual conversation, but in the hiring world .NET appears to be about server applications exclusively. At least in my observations.