I think you are right and is about this feature.
I don't know this feature is or should be "a standard", but certainly make easier to setup an email account.
I don't know if should or not to be implemented on NS. Maybe, if will be implemented, will be a plus.
It is like you want to setup an Exchange email account: you enter only email account and password.
I think also Thunderbird check for this feature when you create a new email account.
Happy FOSDEM 2017 days!
For you and for all who are there!