I think I agree with the analysis. It's why aspects like data verifiability are potentially more important than fancy peer-to-peer routing and transfer protocols. Once you have Merkle proofs of data, it's just as powerful whether it is on the client or server.
Trust and anti-corruption are just two of many properties you need for data locality, arguably less important. Conflict resolution or consensus is still very, very difficult. P2P routing and transfer is a bit of a red herring. You still need consensus between your local store and the remote store. Fireproof does it using IPFS underneath which in my experience tends to be quite slow, but is a working solution.
Cryptographic verifiability make data locality into an optimization problem not a trust problem: https://fireproof.storage/documentation/how-the-database-eng...