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> The language is starting to show some warts due to inheriting bad decisions from former language maintainers (nullable value types and nullable reference types being treated completely differently).

That's being a little too harsh, in my opinion. Even if you were designing both kinds of nullable types right now, it'd be difficult to have them behave the same way without adding runtime support for keeping track of nullability of reference types. And that's quite a big task.

> I do worry about the cognitive burden of remembering idioms and dealing with multiple ways to do the same thing

To me, VS 2019 refactoring suggestions and Roslynator extensions helped a lot to learn and use new syntax capabilities and idioms: you write code in "the same old way" and then often roslyn is able to convert this code using new features, often in a concise, readable but undebuggable way :)

This is one of my biggest pet peeves with C# - it's so annoying that value and reference types behave differently in respect to nullability.