I've seen something like this in CRM and in closed-circuit corporate/institutional groupware. But when discarding RFC-standard text as the canonical form then we also discard (or must re-implement) every functional, security, and deliverability measure that assumes as much in the design when addressing global email.
The simplest illustration I'd give of this is through a question: "how you gonna preserve my PGP signatures?" and if the answer is "ah, you are not our target segment" then you get how it's not a global solution.
The simplest illustration I'd give of this is through a question: "how you gonna preserve my PGP signatures?" and if the answer is "ah, you are not our target segment" then you get how it's not a global solution.