Also this was said by Hunter Beast who now supports BIP 110 too: "I'm generally supportive of the changes in this BIP. Aside from minor nitpicks in language, the 34 byte scriptPubKey restriction I think will prove to be quite valuable in addressing the larger concern of DoS blocks / poison blocks that impose such high computational costs on nodes that a single block would take 30 minutes to verify on decent hardware instead of taking about a second. This is an even larger threat to Bitcoin than either CSAM or quantum, because I've read that CSAM has already been present on Bitcoin for a very long time, and quantum computers aren't anywhere near good enough to be a threat, and may never be, whereas DoS blocks could be introduced by miners who take direct submissions without sufficient checks at any time."