It is not a unique feature. But as a non-FOSS program its notes are not hidden behind proprietary filesystems, so any time you want you can still switch if they go in a direction thr user does not like.
But jokes aside, it is mostly about syncing notes for the selfhosting part. You either go with the official offer, no self-hosting and costs money, or you use a community plug-in, self-hosted, or you use a third program like syncthing, selfhosted.