That means they get to stick around, you double any enter the battlefield triggers, and sometimes you just get a very large and terrifying army very quickly
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Kogla and Yidaro on ETB can have Trample and Haste and becomes an instant threat, Etali, Primal Conqueror // Etali, Primal Sickness has an alternate win condition as we have analized above, Rampaging Brontodon can easily have double+ stats depending on our lands, Ghalta, Stampede Tyrant, Ghalta and Mavren and Ghalta, Primal Hunger have huge 12/12 bodies, while Gishath, Suns Avatar, Zacama, Primal Calamity has multiple great keyword abilities that make it a huge threat and a great finishers for our Dinosaur Tribal
This is especially true for cards that tend to warp their draft environment like Ancient Tomb or Mana Crypt
Being able to give a creature haste from your graveyard isn't even a unique ability in Red, as longterm staple Anger shows how it's done better