Hey Mike
Correct, M&S is an element of the Classic license system. At this time there’s no automatic upgrades for the desktop apps for either subscriptions or classic. Upgrades & updates are effectively “opt in”.
The plan is to get to a point where subscribers are always on the latest and greatest version while classic customers will be prompted to install updates only. Upgrades = major version iterations while Updates = minor version iterations. We realize that lots of people rely on extensions so we’re not going to do anything that breaks anyone’s workflows. We’ll also be coming at this from both ends. Meaning technology on the application side and changes to our developer program to help keep extensions working as we release upgrades. That said, I’m a bit out of the loop as to what the plan is for extensions and how we’ll navigate this shift in upgrades. @ChrisFullmer is there anything you can add at this time?