[quote=“RobinLinus, post:22, topic:1707”] Wouldn’t that require everyone to resync the chain, though? [/quote] Just a reindex, which has been required for upgrades before. Only a very small percentage of nodes are pruned and otherwise the process could just be done invisibly in the background so long as you upgraded before the requirement was active. (Even if pruned it could be done invisibly in the background too, though obviously with a bandwidth cost).
If the node was pruned and didn’t care for the bandwidth cost and didn’t mind a reduction in autonomous security it would be easy to make the values importable.
A lot of these dust outputs are created by quite large transactions, and so constructing it with a txout proof makes the proposal easy to argue against. Some (though sure, not many) are created by txn so big that the txout proof wouldn’t fit, so that form is confiscating. The point that the value of the outputs are small only get you so far because some imagine bitcoin worth millions per coin in the not distant future, so I think it’s important that the non-confisciationess is sincere and not just ‘technically true’-- besides to the extent that the coins do get spent we wouldn’t want them wasting the block weight cap reinserting over and over again junk that is already in the chain. 