Yes, I can see that. But at the same time to make something more useful than a dino, would have to be a higher technology. I mean we already have the toilet. Which if you a big tribe and all your members use it. You have a constant supply of fertilizer. And if you have a Phioma and dung beetle, then you have a bigger source. To be able to replace 2 dinos it has to be Tek. Even if it doesn't cost that much element. But still requires a tek geny to run.