[linknoid]

A lot of the improvements are just logically extending the language to remove arbitrary restrictions. That's what most of C# 10 and 9 appear to be. So most of the features you wouldn't go out of your way to use, but instead stuff that used to be impossible is now possible. I can't say that I've ever wanted a generic attribute, or a constant interpolated string, but if I did want them, I'd be surprised when they didn't work. C# 8 was the last major new language features.

[spaetzleesser]

But a lot of them seem totally arbitrary and inelegant. CallerArgumentExpression requires a lot of attributes. CallerMemberName gives you the name of the caller but not the class name. This is hard to explain. It just seems random.

[guhidalg]

It's not hard to explain, it's a logical and small extension of other compiler-driven attributes. Just because you don't like it doesn't mean it's a bad change to the language.