the player can't use it, so it being broken is a stupid complaint
what people should actually be asking is why they decided to make the attempt at a climatic penultimate boss (big emphasis on "attempt" as it was all rushed as shit) be a HP sponge that you can hardly do 1/20th of its health to, essentially turning the boss into an autoscroller as you wait for the AIs that can actually fucking hurt it to hurt it, while eternatus itself can hardly hurt you or your allies due to its only slightly good offences and its inability to target multiple opponents at once