On Fri, Jan 12, 2018 at 10:35 PM Amir E. Aharoni < amir.aharoni@mail.huji.ac.il> wrote:
More precisely, there is a bit of a technical reason: very simply, such a repository would be itself a piece of software, and it was never completely developed.
There were some attempts to do it, with names such as "scary transclusion", "shadow namespaces", and maybe others, but they were never completed, at least not well enough for Wikimedia sites. There were issues of security, caching, localization, and more. It's possible to resolve these issues, but unfortunately it was never prioritized.
^^ This ^^
Basically: nobody ever had the time to drive it to completion. There's no technical reason it couldn't be done.
-Chad