There's a ticket for removing mobile.wikipedia.org
domains/subdomains, which are legacy domain names superseded by
and its subdomains.
The rationale for the removal of these legacy domain names is to help
support HSTS preloading in browsers with the existing TLS SAN cert.
After review of the ticket, can anyone think of a compelling reason to keep
those old domain names?
I opened a separate thread about this on wikitech-l under a different
subject about this as well.