I get "This email address is already in use" when trying to change my e-mail address on my Garmin account.

From what I see on-line, I have to delete this account and then enter my new one.  WHY !!!???  If there is a link for changing my e-mail, it should allow me to change it.  What other option do I have for changing my e-mail?  I don't want to have to download my data.  It should not be this difficult.

Please advise.