Do you need to sync more than one user?
Do you also use trakt outside of Plex?
If the answer is no and you simply want to sync watched status between servers on a single account then plex-sync works great whilst webhooks can push the watched status to trakt (but not necessary.)
Totally agree but can be picked up in Tautulli if I recall. Not a perfect solution but a solution all the same in the hope that native integration comes.
Just throwing it out there.