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RBF only works if you have some way to estimate to begin with.
Depends on what you mean with “works”. Bumping blindly to higher feerates if you didn’t get confirmed in a block does work fine, if you are not trying to pay the minimal amount or make it into the next block.
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So bitcoin didn't relay transactions before 2015 when fee estimation was added? https://github.com/bitcoin/bitcoin/blob/v0.10.0/doc/release-notes.md#transaction-fee-changes
And only computer scientists without any experience in the real economy think it's a problem they can solve (they can't)
it was always about fee estimation, it's just fee estimation is hard and wasn't prioritized to the same extent till recently.
RBF only works if you have some way to estimate to begin with.
WHY do you want to relay transactions? (any transaction)
think about it.