Re: Reconciling theory and in practice -- do the specs need updating?

As I say this is only a problem if you are programming on an instance level
with hand coded code. If you work at a meta level then all you need is for
clients to provide their @context properly and provide an @context on
fingering or in /.well-known/ then this is not an issue for meta level
systems. Most protocol extensions can be automated even at the UI end of
the problem or prompt for meta-admin assistance to appropriate mappings.