What's the state of std.experimental.typecons.{wrap/unwrap} ?

[sighoya]

Link to page: 
https://dlang.org/phobos/std_experimental_typecons.html

I'm very interested in auto wrapping of structs/classes to 
interfaces as it would aid to close the gap of structs to classes 
regarding interface conformity.
Further, it would allow D to strive for the route of existentials 
(a.k.a. boxes) as duality to generics/templates.
In the end, it would help D to become much more uniform, I think.

What's the actual the state of structural wrapping/unwrapping?

There are further things which irk me a bit:

>If Source is a struct then wrapping/unwrapping will create a 
>copy; it is not possible to affect the original struct through 
>the wrapper.

I would expect this to be the case. However, what about ref 
structs, can they be supported, too?

>Source can be either a class or a struct,

Why not interfaces, too?

>allSatisfy!(isInterface, Targets)

Why not classes, too?