Let Armadillos attack Spiders and Cave Spiders

So Armadillos are bred with Spider Eyes and Mojang wants the player to interact with Armadillos more but all they are used for is Wolf Armor. Why not solve both problems at once with 1 simple thing? Armadillos attacking Spiders, because they eat spiders in real life so why not in Minecraft too? Plus it will make them useful for AFK spider farms if they do it automatically. Speaking of which, why not add Scorpions too and have Armadillos attack them too?