Water is whatever comes out of your tap. H2O is the molecular formula. You can filter water to make it drinkable. You can't redefine H2O without breaking chemistry. BIP-110 wants to decide what counts as a valid Bitcoin transaction at consensus level. That's not filtering spam. That's redefining the protocol. If you want to block inscriptions, run a node that ignores them. Don't vote to make them impossible for everyone else.