I don't think that's McVays game. McVay likes the Tom brady concept of throwing the ball away or tucking the ball and taking the sack if the play breaks down.
I think this is pretty silly. McVay doesn't have a "game" .. his scheme is built around his players. If he had Mahomes, Rodgers, Wilson, Allen, Big Ben, etc. you think he would tell them to not escape pressure when they can, and try to make off schedule plays?? Of course he would want them to do that.
Historically Goff has really struggled in those situations so McVay's offense is built similar to Brady and Peyton's, intermediate timing based passing so his QB can be surgical. I think part of what OP was saying is fair, because Goff is an underrated athlete and has an ability to move well when flushed from the pocket.. and that off schedule part of his game can develop still. There haven't been many opportunities for him to do that this year yet, so maybe it has improved. His throwing on the run definitely looks better.
But to OP's point, if he can make a few more off schedule high level throws per game when flushed out of the pocket, he will hit an entirely new level of dominance. He could push Mahomes/Wilson/Rodgers levels. Because what separates those guys is they play elite from within the pocket and within structure, but when things break down and flushed from the pocket they are just as deadly.