Hey, well I didn't really...
Still on the todo list.
I learned there's a new way to use PostGIS in esri world: since esri needed to be compatible with cloud offerings it's now possible to have a "pure" PostGIS geodatabase without even installing st_geom libraries (https://www.esri.com/arcgis-blog/products/arcgis-pro/data-management/create-an-on-premises-postgis-o...).
On the other hand, the libs for PostgreSQL 15 are now available (included in the Pro 3.2 download), so the delay to the latest Pg version is not that big ("only" 1 major release).
So I'm pondering... do I just keep st_geom or do I ditch it...
As for how to migrate, my guess is copy/paste every single FC using a script. Which obviously forces a rebuild of all views that reference those FCs and that's why I haven't moved yet.