- if txn relaying nodes censor something that a miner would mine, users will seek a private/direct relay to the miner and vice versa.
- if direct relay to miner becomes popular, it is both bad for privacy and decentralization.
- therefore the dust limit, should there be demand to create dust at prevailing mempool feerates, causes an incentive to increase network centralization (immediately)
the tradeoff is if a short term immediate incentive to promote network centralization is better or worse than a long term node operator overhead.
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my take is that:
1) having a dust limit is worse since we'd rather not have an incentive to produce or roll out centralizing software, whereas not having a dust limit creates an mild incentive for node operators to improve utreexo decentralizing software.