Cripes, I just wrote a longish response to this and then deleted the whole damn thing! Initially I agreed with the explanation provided by
@dieterbrock , then I thought I agreed with the explanation provided by
@RamFan503, and now I'm back in the muddled middle.
Regarding the Pickett fourth down play... at first I thought it was as the league says-- not reviewable.
Then I read Rule 15 Section 3 Article 9 point (h) which seems to allow the Replay Official to "advise" in this circumstance. This rule seemed to contradict Rule 15 Section 1 Article 2 point E-3.
Now I'm thinking that Section 3 rule is either "superseded by" or is "a subset of" the Section 1 Rule. My reasoning: The wording of several points in Section 3 are so vague that it would seem to encompass all sorts of things that are not reviewable.
Bottom line: I currently believe the refs correctly administered the letter of the law for a shitty rule. The NFL does this over and over... like with the "to the ground" bullshit rule.... the refs had to properly administer a crappy rule.
But gimme 20 minutes and I could change my mind again.
The NFL better look at the end of the Rams-Steelers game and try to allow for a way to let replay affect that play. If this were a playoff game or a Super Bowl, it would be even a bigger deal than it already is.