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IPFS encompasses more than just a DHT: - representing content addressed data with hashes in CIDs - Discovering them (via the DHT) - Transfering (Bitswap, HTTP, Graphsync, sneakernet and more in development)

I'm not 100% certain what you mean by the DHT being sessionless.

> At the scale of Bittorrent and DNS you cannot manage this kind of session state without centralization.

You don't have to route content via the public DHT. Depending on what kind of data you're publishing, you can use a private DHT swarm, or delegated routing with HTTP.

> This is incompatible with decentralized scaling.