Is `alias this` a mistake?

[Ola Fosheim Grøstad]

On Thursday, 5 August 2021 at 17:24:56 UTC, IGotD- wrote:
> I never understood the benefit of structs are value types. In 
> what use case would you like to pass the value of a struct 
> rather than a reference.

Functional programming requires you to conceptually pass by 
value, then passing it by reference becomes an optimization. But 
in D this is lost since you also can pass by reference. So there 
is no advantage to having the struct/class split.