Hi Brogan,
yes, it is a suggestion when it is not yet possible to add one more field for the user to confirm his e-mail.
I am actually wondering why we do have 2 fields for the Password but only one field for the e-mail-address on the XF-registration-form ?
Looking at Facebook for example, they do have 2 fields for the e-mail-address and only one field for the password.
Not sure what is common, but I see this happening couple times that my users put a typo in their e-mail-address when signing up.