Usability of "allMembers and derivedMembers traits now only return visible symbols"

[David Nadlinger via Digitalmars-d]

On Sunday, 4 September 2016 at 12:33:07 UTC, Andrei Alexandrescu 
wrote:
> Thanks for answering. Yes, we really need introspection of 
> private members. One way or another we need to support that.

Do we, though? It's easy to state a general claim like this, but 
I find it hard to actually justify.

  — David