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Because most transactions aren't unusual at the moment. During the ordinals/inscriptions craze a few years ago, those transactions were a high ratio of confirmed transactions. If something like that happens again, and knots filters them, people that want to transact this way will just bypass knots nodes as mempool peers, making a sub network of nodes, just like libre relay did. Like you said, this is a waste of time to argue about. If you don't get it, you haven't thought about it enough.