Thanks for the kind words! To be fair, Syncthing itself is still actively maintained (they just released 2.0), it was the official Android app that got discontinued due to Google Play issues. Community forks still exist on F-Droid though.
But yeah, Syncthing and Synchi have different workflow. Syncthing needs daemons on all devices and can't sync to a mounted drive, NAS path, or local folders on the same machine. Synchi is on-demand and doesn't care where the two roots are. This is also why I started working on it. I used syncthing for a few years before that.