Graham has skills still, but few can do what Watkins does.
Watkins is a receiver that plays on the LOS and can get off press coverage or even normal man coverage, he plants well makes moves and gets open consistently. He's a good route runner and had good hands all year. He did drop 2 in the playoff game, canno excuse that, especially the long one, but that was only his 2nd on the year, far below a normal WR.
And he was a solid deep threat. Goff is still learning how to throw a good deep ball, he did it a few times, but miss many more. Watkins was there, was open and ball would be off. Showed many stills of this happening.
Not only that he a life-saver in red zone. Without him our red zone offense would have really been bad. With him it wasn't top notch but passable. He can use his body to bet tight coverage on a slant and fights for the ball.
He and Woods best pair of receivers Rams have had since Ike and Torry and people wanna get rid of him. Pretty amazing.