When I think about blockchains, the major strengths they have over other networked data sources are decentralization, cryptographic verification, and (depending on the tech) anonymity and smart contracts.

There's a lot to be said for decentralization as a 'probably a better idea than letting Elsevier run the show', but it's kind of vague in my head still.  The examples you point out from your own field solve a lot of that pain point without a blockchain, albeit not completely.  (I feel I must note I have serious discipline envy, my field's leading journal *finally* said that arxiv-like prepints don't count as prior pub.)

The big thing for me are smart contracts. I keep returning to the idea that there's eventually going to be more public support of science and it's going to be directly, democratically funded through these.  Not as a replacement to grants, SBIRs, etc, but as an additional cool source.