Blossom is still unable to do chunk-based fetching though (again, to my knowledge), so that'd be a big limitation and I don't think the UX would work well in that case.

I think many users would, myself included. But I think there's value in how Odysee does it by turning every client into a pseudo-seedbox. Think about what every app on your devifes caches - But sharing said cache. It's more decentralised, resilient, censorship-resistant and because of that, especially when paired with the idea of local Nostr relays running with clients, keeps more with the spirit of Nostr.

I'd also seperate the shitcoin and shitchain from the media functionality of the protocol.