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PDSes should be sharded not replicated. Your posts live on your PDS which lives in one place (although it can move).

What's stopping us from doing both?

Cost and complexity tradeoffs. IMO the relay/appview is the current bottleneck.

This is why I'm hoping fiatjaf has a recommendation here. I have a feeling he might have a proposal that solves this. But doesn't solve all of it, just some of it.

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