And we know that how? He was dumped by the Colts after struggling in their offense, and his receiver rating and catch % have gone up both years he's been in New England. He's playing a low tier role right now, are you seriously arguing that rule couldn't be expanded if needed? because you're wrong and it has.
Dorsett was basically our WR3 in the playoffs and again, made some good catches in that role, especially in the AFCCG. He actually had a better catch % than Julian Edelman or James White this year, so there's something to be said for making the most of your targets, and it showed because Brady was throwing to him in the playoffs.
I agree that "he is what he is," but I disagree that we know what Phillip Dorsett is. I think we're on the verge of a very pleasant surprise with him, he's shown steady improvement in his role and I think he's on the cusp of expanding that role somewhat.