See the links I listed above. None of those features solved a language problem as large as the lack of sum types. It baffles me that they even spent time on them before providing a feature that is in such high demand (and has been for more than a decade).
I understand that you shouldn’t always give users what they ask for - but this is something that has picked up steam in other languages because it’s actually useful and makes code bases easier to maintain.
I've used C# since 2008 for business software and high performance computing. I've not missed sum types at all. Most of what was added is something I see a lot of value in. I don't like that it, by design, obsoletes some older parts of the language, but that's about it.
I'm now using C# on linux almost exclusively. No complaints from me!
I understand that you shouldn’t always give users what they ask for - but this is something that has picked up steam in other languages because it’s actually useful and makes code bases easier to maintain.