A stegosaurus can collect hundreds of berries in a few short seconds. You can use those berries to tame more dinosaurs and feed yourself very easily. The only problem is that they are very slow, so if a large predator attacks you while your on your stegosaurus, it would be better to jump off and run away while your stegosaurus distracts it. You may lose your stegosaurus though
If you don’t want to run around gathering fiber and wood to quickly build a base last moment before the Allosaurus pack nearby spots you, if you want to tame Argies quickly and effectively, if you want to take out raptor packs quickly, you will need a stegosaurus.