> I'm also not sure that something not being intuitive or natural is necessarily a bad thing in of itself. You state it as if it's so, but you haven't demonstrated that this way of defining a list is worse.
I would argue that a language having more features, without the feature being helpful, is a bad thing in itself. If the syntax isn't necessary or very convenient in many cases, it shouldn't exist. The syntax being natural (which, absolutely, is a very subjective thing) just makes it less of an issue, I'd say.
Every new syntax added to the language adds cognitive overhead to readers of code. But also, it adds possible interactions with other language features that may be added in the future. Now, the example I brought up doesn't really concern the second point, I'll concede that. But unions? That is a big concept to add to a language that already has decades of existing conventions and tons of other features. How will they interact with generics? Nullable reference types? And, just as importantly: How will they interact with any other features that might be added at some point that we don't even know about?
I'm not against adding syntax sugar. For example, I quite like primary constructors, which is another relatively new C# feature. I think it's a bit annoying that they were kind of added in a roundabout way, by first adding records and then adding primary constructors to classes, but this time they don't define properties but fields...but in the end, it's a nice convenience feature when using constructor injection. Which, whatever one may feel about this, is pretty common in C# code.
But the thing is: If every single feature that's nice for a few use cases gets added to a language, the language will explode. The best example for this is C++. C# is definitely not that bad, far from it, but my point is that I want it to stay that way :)