What I really need in C#

As for 14.11.2019

• Every method and property are async by default and awaited by default.
• Everything immutable by default, with hardcore compile-time optimizations.
• Current Type generic constraint.
• Nullable reference types behave like nullable struct types. E.g. HasValue, Value etc. Or vice versa.
• Generic type inference of the generic type constructor.
• Type inference for parameters, return types, fields.
• Something to do with polymorphism hell. (Combination of required parameter names with default values or DTO as parameters.)
• Dangling comma in parameters list.
• Compile-time rewriting of the Linq queries to simple foreach, if etc.
• Microtypes and record types support.