From a developer point of view, maybe. From a user point of view it’s a quite reliable and well known mechanism to sync between platforms. Dropbox is already what I personally use to manage my documents between all my devices, it’s part of my various workflows. I personally don’t want to add other syncing mechanisms if I can avoid as that forces me to create/manage an additional account and give my trust to an additional platform.

Of course I may be an outlier but I don’t think that’s the case, Dropbox is well established. Inkdrop looks really, really nice and I might be a user of such a tool, but only for the editing and categorizing part but if I cannot disable the syncing using your backend that’s a blocker for me.

Anyway, congrats for the work that you’ve done, I hope you will change your mind at some point :)