I think you pretty well nailed it.
Also after reading this I think Ben is still a bit bitter about that final drive in the Green Bay SB loss.
https://steelersdepot.com/2020/12/ro...e-and-sanders/
I still remember him trying to not be salty about it, but basically indicating that there were numerous problems on that drive because the young WRs didn't know where to line up or what routes to win.
But from the above article: “And fill in for each other. Play each others spots. Which I think is one of the most special things about the group. Literally you can plug each guy into each position, each role, each route. Which we do a lot of that with the no-huddle, moving guys around. They don’t blink. They don’t second guess. They don’t question. When I say, ‘let’s do this, let’s do that,’ they line up and do it. I think when you talk about this group, the collectiveness of all five of them is what makes them so special.”
That kinda says it all to me. Ben wants these guys to play "WR" and worry about being good at their position and who gets catches and TDs will get sorted out later.