These guys are really good for harvesting fiber and berries, but what is just as good is that if you run into a raptor or a pack of dillos this guy can take them all down. They have 3 attacks swipe attack (attack), swipe harvest (fiber), and bite (berries). Being a herbivore is also good because if you take down something big it won't eat all the prime meat.
To get wood, use normal attack which is slashing with claws. To get berries, use bite attack. To use bite attack on mobile, change multi tap to alt attack 2 and tap with 2 fingers when riding the Therizinosaur. To get fiber, use the tickle with claws move. To use the tickle with claws move on mobile, jump when riding the Therizinosaur.