The lore was set by the first few movies. The Yautja hunt humans, have honor and respect a worthy adversary. Their honor is why they don't kill unarmed humans (like Anna in Predator) and their respect for worth adversaries is why they let Harrigan go after presenting him with a trophy and why they never came back for him or Dutch. That was the lore for decades and Trachtenberg is turning it upside down. You can point out that the Yautja captured humans in Predators, but that was only a slight change from the first two movies because the humans were still being hunted for the first time, just on a planet other than Earth. In Predator: Killer of Killers, the Yautja have been, for over a thousand years, capturing humans who have already survived hunts and defeated Yautja and taking them back to the Yautja homeworld to fight against each other in a colosseum for entertainment rather than sport. That's quite a change to the lore and to the Yautja, who now appear to have no honor because they'll enslave you even if you win, which lessens their mystique and makes them more like every other alien enemy.