Birds’ nest.

An explanation from one of the maintainers explaining why they removed the toggle from the UI and try to hide it from users because it’s going to be deprecated eventually:

https://forum.syncthing.net/t/ignore-delete/15414

That must have been it, appreciate the clarification.

I’ve used it in the past, but they are deprecating one-way ignore-delete syncing.

My understanding of rsync was that it was pretty painfully slow.

I guess maybe too mainline for everyone here but I use an Asus router flashed with the Merlin OS (a painless easy process) and it works excellently. No issues setting up all the things you mentioned.