Sagan may not win every sprint, but there is no other rider that gets you as many points as he does. Yeah, a few of the pure sprinters can outrun him, that is... when the course is flat and easy enough ...so they can stay in the running.
But he and Alaphilippe are the two best in the sport right now. Both, just basically really good at every aspect. With obviously Sagan leaning more to the Sprinter’s side, and Alaphilippe more to the Climber’s side.