the longer a broken bone sits in the wrong alignment the more harmful it becomes later on. the damage that was caused by taproot, empowered by leveraging segwit, is severe. the nearly 2 year long running manias in shitcoinery to flood bitcoin blocks with pixel monkeys did a lot of harm to the chain, to lightning and to large settlement transfers. it's only a question of catalysts that can cause it to happen again, the spammers just get bored and have manias in random turns. if you have a bucket, and there is one big crack up high, and a small one down below, which one is the most important to fix? the lower one. the one that will keep leaking and is easiest to fix (smaller). the big ones up high (non-consensus, mempool) are not as critical as the hole that lets those keep on getting baked into blocks (one crack segwit, and then crossing that and widening it, taproot).