While I realise you are disapointed there, arguing the semantics of what you or I believe to be the primary purpose of the feature is not going to change much in the context of what is going to be removed. Your proposal there would be for us to strip out the email functionality, rewrite parts of the software to be compatible with version 5, and then support it into the future. This is something we have decided not to take forward as a company.
If you wish to continue deprecation discussions, you can certainly do this within the topic for that purpose, which you can find in the following location