+1
You may not "need" it on paper, but it is still a good idea. The truck may still handle okay without it, but it will handle better with it. Having the integrated sway control as well gives you a "belt and suspenders and duct tape" approach to unforeseen sway issues you may come across.
Sidebar:
Belt - The trailer should be designed and loaded with enough tongue weight that it shouldn't sway in the first place.
Suspenders - The WD hitch's integrated sway control will dampen any attempts to sway.
Duct tape - The truck's sway detection system will apply trailer brakes if it all goes to heck in a handbasket.
The WD's integrated sway control also has the advantage of dampening any push-pull effect you may feel from passing semis, because it keeps the trailer from being blown off course and in turn tugging/pushing the back of your truck around.
Your tail-to-dog ratio with a large 10,000lb trailer and an F250 is about the same as a 7,000lb trailer with an F150. The tail isn't wagging the dog yet, but they are pretty evenly matched.