Adaptive Trigger is a new feature for the DualSense controllers, allowing the game to control how stiff your controller's trigger buttons feel. In the right setting, with the right game, this can be an experience-enhancing thing, sure. It's no biggie if you don't have it and it's not applicable for every game out there. Which begs the question — why is Apple paying any mind to a super-niche feature of a product that is not...
The signals here seem to lay waste to the theories and speculation that Apple is prepping to launch its own gaming console in the near future. If it is... it's probably not very near, otherwise it wouldn't be endorsing the DualSense and its features, right?