You had me until you tried to make a valid point by bringing up what Cooper Rush did against players not even in this league anymore. Yikes. If you are ok with a play book that lacks vertical plays then that's fine. If you are ok with receivers running the same 3 routes all game then ok.
You fell over the playbook not having vertical plays if you watched the Cooper Rush video. He's definitely throwing downfield routes. Playing against 2s is the same for Cooper Rush as it is for Dak who proved he could beat 2s against Philly by the whopping 6-0 score.
Dust yourself off and ponder this:
How many ways are there to run downfield?
Something else to ponder: Just because Scott Linehan does not call it doesn't mean it does not exist. So if you would be so kind, please provide said playbook for verification.
I did post yesterday after watching Garrett's presser where he says as we acquired personnel that allows us to run the ball, we've moved away from the pass first to a more balanced offense. And he's fine with that.