Re: MORMON, it hasn't been the case with every Rudin production. I don't recall hearing it in place for A DELICATE BALANCE or THIS IS OUR YOUTH, for example.
I do recall other little house rules on occasion, though. RAISIN did not allow any snacks or drinks up from the bar into the house, which was revelatory. I had grown so used to the din I had forgotten what a show without is was like!
Words don't deserve that kind of malarkey. They're innocent, neutral, precise, standing for this, describing that, meaning the other, so if you look after them you can build bridges across incomprehension and chaos. But when they get their corners knocked off, they're no good anymore…I don't think writers are sacred, but words are. They deserve respect. If you get the right ones in the right order, you can nudge the world a little.