I agree Jeremy Smith, PHP 7 is not a surprize like many of the other issues with Adobe. We all know this is the current version and also the whole point of MySQLi extension and purchase was to leave behind outdated methods.
Without doubt the Paramount direction should be that all Extensions work properly with the latest version of PHP. Not alpha versions or beta but current common releases. ESPECIALLY when we bought MySQLi Extension, what a couple years back, to avoid these type of problems.
It comes down to prioritizing and making sure the CORE programming aspects are in place. CRUD page creation and Security Assist. Everything else (fluffy stuff not related to programing in a modern compliant manner) can wait.
I run my own server by the way and spent countless hours upgrading as much of the code as possible to MySQLi. But now I find a key element, which is the ability to log into a website is missing. Frustrating, as well as concerning when I usually am patient and a go with the flow kindda guy as I can write my own code if necessary. But with a new Server rollout the pressure is a little different then usual :-(