I'll happily chime in to reiterate my comment from the aforementioned thread and state that I would love to see CasePaths introduced as a language feature (as well as Enum properties but I suppose that's maybe for another thread).
The discrepancy in ergonomics between Structs and Enums is probably the area where I'd most frequently benefit from quality of life improvements, and in my experience a non-negligible source of friction to the wider adoption of safer, more unambiguous patterns/architectures in Swift codebases.