I am glad to hear that I am not alone on the concerns of the upgrade and securing the admin page. As you stated, a STRONG password can be more beneficial. MIAB has a strong recommendation in protecting SSH by creating a key rather than a password, yet the admin page is open for attacks (I did not see limiting incorrect logins). I read in the forum, that maybe a firewall rule would be better in protecting the admin page, but that is beyond my knowledge base.
Looking forward to the next version and upgrade to 18.04.
I really like MIAB, for letting a novice, such as myself, to manage my domains and emails.
Again alento, Thank you!!!