Stubborn, maybe, but if it ain't broke

https://slrpnk.net/post/34747703

My impression is that carnivores need teeth that pierce and rip, so they can’t do much ruminating.
Most mammalian carnivores have a sort of mix. They have the piercing canines, then their molars act like scissors to slice off hunks of meat. Herbivore and human molars are more for crushing.