Giving PMS admin privileges and full control? Giving PMS admin privileges and full control? No thanks. Just look at all the permissions and requirements. Just reading the migration stuff alone should be a huge turn-off on using native IMO. With it contained in Docker, the chances of Plex breaking due to a DSM update would be very low. And who knows if Synology releases another update or patch that breaks Plex and a migration or rebuild would be required again. It would be a massive inconvenience if something messed up and I had to redo it over again.

After spending over a week scanning for metadata for all my media, setting up the library to the way I like it, TV show intro detection, etc. Lastly, while you already went through it, is the migration process would really increase my stress level. I do like using the trakt plugin to sync my watched and playtime data to Trakt

The second, less of an issue, is no more plugin support. I run hyper backups and have snapshots on for my Docker data folders as well as Plex Data in an off chance I need to quickly restore data. The biggest is not easily able to back up the entire Plex data folder after migration, especially within the DSM GUI unless you have set up access to /var somehow (or maybe it is easily accessible in DSM7?).

Plex synology dsm 7