FWIW, every program looks like one that usually is set to start at startup; the intent is to have the dialogue only show up when you start an app for the first time. Since so many background apps were running at startup they all slowly needed to ask for their permissions.
> create a migration UX
Might not be possible if the previous MacOS isn't full-on tracking what folders a program is accessing, and it still would likely encourage allowing all permissions if the user has more than 30 different programs accessing enough folders.