The main thing I'm concerned about is that by tightening up the definitions, you may be subjecting smaller and medium-sized organizations to more work than they need to do. You'd be making something appropriate for a large organization and trying to apply it to a small one or a very small one, such as a one-person company, so I'm a bit hesitant about saying “This is the record you must keep for every single email.” For 99% of these organizations, that's overkill.
On November 7th, 2017. See this statement in context.