Isn't that agreeing with me or I'm missing something? Sounds similar with what I said...
A theme with those movies is playing with forces barely controlled underestimating the threat they pose. I guess making them near-invulnerable to bullets are a nice way to show that. But even so, firing at a T-Rex (even if paleo-accurate) seems suicidal at the very concept, specially without the specialist big-game ammo you mention.
Orcs and Goblins have been a staple in fantasy as enemy races for decades. Greenskins having culture, intelligence and not being treated as guilt-free genocide targets is a rather recent development in the west which went overhead of the Japanese market, focused as they are on their AD&D-inspired games.