I'm gonna present two lines of thinking:
1) There was no room for him in this offense, he couldn't provide what we needed at X and we have a log jam at slot where he would need targets to thrive and just body up CBs.
2) What happened to the guy that was just destroying people and wowing everyone in camp? Is there a stubborness to the Rams and their offense?
I'm not gonna use Jourdan's line here because peoples heads would explode but just say that it's probably both: The Rams are stubborn in their offensive scheme AND Robinson only offers very limited use in how he can beat coverages at this point in his career.
I think he wasn't smart enough to grasp the concepts. This offense is one of the hardest around for wideouts. McVay has very high standards on the mental end of the spectrum and layering of reads and shit. Down the road we're gonna hear most likely that he had problems with all that which affected his game.
Because he's a guy who just bodies opponents and we have a QB who will make those throws. But he didn't for numerous reasons not just the mental side.
Bottom line is the Rams might be stubborn in their scheme, which is to say McVay is stubborn in his scheme, but they tend to maximize guys who fit. The key is that fit. So I remain extremely disappointed in the entire Robinson episode, because I've always loved his game. Really irritates me to see this shitty episode end on this note but oh well moving on now.