The goal of this enhancement is to have all letters that are sent to parents become part of the student record. The negative impact is that now we have no record of the letter being sent and nothing to refer back to if a parent would question what they received.
If all of the reports that can be done as letters would have the same check box that the vaccine report done in letters has it would provide a well documented health record for all students. The check box for vaccines is Update the records of the students that letters were printed for.