Why does the Dilophosaurus have a the frill and spit venom? Why are the Velociraptors actually bigger than they should be? The Raptors in the films are more accurate in size to the Deinonychus and Utahraptor.
The Answer is because these are movies. Liberties are taken. And these are genetically created man made dinosaurs that are not 100% accurate. It really is not that big of a deal. Think you need to relax a bit haha, its not that serious.
I'm mostly being comedic; I've wanted to like the
Jurassic Park/World series from the get-go, but I've given up hope on the franchise being a smart series a long time ago, despite how much the directors and writers try to make it seem like they're taking this trilogy as serious sci-fi with themes and ideas and whatnot.
(Which is the genuinely offensive part; in a promo video for the upcoming tie-in video game, the creators make a point to emphasize how the
Jurassic Park franchise is effectively the metric by which the general public understands dinosaurs and prehistory, so it's like "Well why are you actively going against everything we've learned in 20+ years and then trying to write it off as 'just a movie, lighten up scientists'?" It's an insult to everyone's intelligence if you ask me, and it's not like they're engaging this idea in any of these films outside of some throwaway lines, even though that would elevate the material to make it a much better, more cerebral series.
(Also, the franchise raptors are technically based on
Deinonychus -- though still a bit oversized, not nearly as badly as if they were actually supposed to be
Velociraptor -- but they just carry the name
Velociraptor because Crichton based his naming system (and most other aspects of his dinosaurs pre-sci-fi touches) on that of a popular paleoartist from the 1980s with some questionable taxonomic choices that most paleontologists disagreed with.)
That said, at this point I'm just baffled by that particular design choice above all others; it's like they're actively trying to find the dumbest, worst way to design a dinosaur. It's not enough for them to be out of date, now they're just randomly adding pointless extra features that won't bear any film fruit anyway.