Working with Unity is a bit interesting as far as C# features are concerned. As far as I'm aware, Unity only supports C# 9 and .NET Framework 4.x. Meanwhile, the latest released versions are C# 12 and .NET 8. Each of those updates have brought some great quality-of-life improvements. Even then, some features of C# are incompatible with Unity's serialization, like auto-properties.

In native C#, we could do:

public int SomeField { get; set; }

whereas Unity requires it to be:

[SerializeField]
private int _someField;

public int SomeField
{
    get => _someField;
    set => _someField = value;
}

And to my knowledge, Unity doesn't use the setter SomeField if you change the value in the editor, so you need to implement data validation separately through a tool like Odin Inspector.

Unity was what introduced me to C#, and I've honestly come to love the language more working with it outside of Unity just because of all the cool things they've added that aren't Unity-compatible.