Fighter: If you have a tribe of over 3 people, this is your mount. With the special saddle that the Gallimimus can hold, you can have 2 passengers, plus the driver. With this ability, you can have 2 people fully armed, and they don't even have to worry about moving, now talk about high DPS!
Scout: The Gallimimus is one of the fastest mounts in the game, and this allows for easy scouting and and transport
They might be useless for some YouTubers. But these things are literally the FASTEST thing in the game. They are even better on multiplayer. They can carry loads of ppl to quickly enter the battlefield when you are raiding them and the Dino gate is exploded. One person drives the Gallimimus and the other two shoots with the assault rifle. Totally op