Re: email-arch intro

> The architecture presented in the document is a model under which we
> believe our protocols work, but there is always a difference between
> architecture and implementation and sometimes it is perfectly fine
> for protocols to break with the architecture.
Your proposed text looks fine.  I hope we don't have to worry about
people appointing themselves as architecture purity police, but this
is a reasonable explanation of why anyone so inclined needn't bother.

R's,
John