TFA actually suggests having a "RenderAsEmail" method on the "Report" object! That right there should have been a hint that this line of reasoning is flawed. It

TFA actually suggests having a "RenderAsEmail" method on the "Report" object! That right there should have been a hint that this line of reasoning is flawed. It would result in things like mixing presentation logic along with business logic in the same class. The author realizes this but does not seem to see it as a red flag.