docker-sync native_osx does not need anything on the host… that is all gone.
The problem with everything you put on rsync alikes, as lsyncd, is the file watcher - and that is what you will face. Its the huge CPU hog which will happen on any fswatch implementation on OSX, no matter its HFS+ or APFS - so what you did, we already went through and have with the rsync strategie (included in docker-sync).
But its very resource hungry and gets worse as longer is runs. It also will lose FS events if you branch change and things like that.
You can believe me, that solution is by no means different then rsync, unison local (unison-filewatcher) and probably every OSX native sync solution out there - detecting FS changes - thats the actual PITA. Syncing is super easy with every of those tools.