We need 5 receivers. I am fine with Williams as #5. It's just that I think that Pop should be getting more reps and Williams fewer. That doesn't mean that I don't value Williams and hope that he develops next year.
With regard to production, I just think that, given his number of reps on Offense, I would have expected more targets and more receptions.
That's NOT a knock on Williams. I would rather have Douglas as a possible target. Maye might actually use him more if he were out there more. If niether is going to get targets, then Hooper should be playing more. We could use the extra blocker.
However, that being said, even #4 WR's needn't be getting a lot of reps with effective targets at TE and RB.