There is no question that Williams is having a great season. He has made himself a lot of money this year.
The thing that is frustrating is that he has potential for much more. He is leaving yards and plays on the field every week. He doesn't play up to his size and athletic ability and doesn't really seem to have that innate ability many great WRs have to adjust to the ball at the end of a route or in the air. As a result, he doesn't win many contested catches. He doesn't run great routes, which is one reason that, despite his speed, he rarely gets good separation except on crossing routes where his defender is often impeded by others.
It is worth noting that, despite his speed and size, the Chargers have rarely targeted him deep; I don't mean 20+ yard throws, I mean true deep shots, like they attempt with Benjamin and used to attempt regularly with VJax and Floyd. I think part of the reason they haven't done that is a lack of trust that he can go up and win a contested deep ball.
All that said, I have him in 2 of 4 leagues and will probably start him the rest of the way in both. His past 2 games, he had 11 and 14 targets, respectively, his 2 highest target games of the season. That trend combined with his schedule is really appealing. It feels like he is close to a real breakout game of 30+ points. I want him in my lineup for that.