Indeed The long term goal for bitcoin is for the chain to be full of contiguous data spam 🙂 We want cheap blockspace to help with L2 security and scaling. Therefore spam is inevitable And contiguous data spam is the least harmful to our nodes And, as you say, in order to defend mining decentralization we must ensure the public relay network can help the small miners to predict the next block and see which transactions are likely to get mined. To help with that, I've started a LibreRelay node today

Sure, but that begs the question again since 83 byte op return as consensus rule this would solve the same problem just a well. Bringing us back to - what is the benefit we get from 100Kb op return vs what is the cost/risk of keeping or removing it?