Hi there, just want to clarify that Nebulus is not a replacement for IPFS or competes with IPFS. In fact it internally uses all the features you just mentioned. In fact it's even powered by JS-IPFS and makes use of the "--only-hash" features and other features you mentioned.

I needed a programmatic way to do all these things (as well as many other user friendly features that the IPFS raw protocol will never provide) and the existing IPFS libraries don't provide a way to do so, so I built it and have been using it from another project, and it was so useful that I decided to extract it out of that project into a standalone one. Just hope others find it useful as well. Thank you.