I think it's clear that Watson figured we'd run all over Texas, and then hastily inserted some pass plays when he found that his run game was getting stuffed.
I think that's pure conjecture, and it is far more likely that it isn't the case.
We installed new formations and new looks for what was then the biggest game of the year, by far. We used these new looks we had never, ever shown before to throw off the Texas defense. Obviously, we still needed to run our base offense, or there's nothing to throw them off of. But the change-ups worked to perfection but for the execution. Does it really seem likely these tailored new wrinkles were something that always existed, to be dusted off just for emergency situations, but never part of the plan?
Additionally, when we are struggling and our game plan isn't working, Watson (and Bo) like to get back down to the basics.
I agree one concern is that receivers have limited practice time for pass plays (in general). Not sure how that is playing out and affecting the team, but come on now, we run the ball 70% of the time this year, and that's the offense that not only Bo has wanted to steer us in, but which everyone has been basically begging for. It has obviously paid off in many ways, but there have to be trade offs, too, and that could be one of them. Can't have your cake and eat it, too.
We did make adjustments in that game, but these new formations and routes that were likely installed
for it don't count as one of them. I remember hearing that in the 2nd half, we changed the way the OL was blocking (maybe that was a different game), and it worked. Having flexibility and being able to change what's not working, and adapt to the game scenarios as they unfold, is such an important quality in a coach - I guess I would say, that this seems to be really scrambling for ammunition against Watson.
The point is that Watson tends to respond to circumstances as they come up; a great coach anticipates the change before it is necessary.
Now I'm not sure if you are serious - because Watson has anticipated and come up with outstanding gameplans attacking teams' weaknesses, which we saw plain as day against Missouri, KSU, Washington, Texas (believe or not), and most impressively IMO, Oklahoma State. If this is the metric to judge coaches by, Watson gets a 'great' grade for this year. SDSU, granted - was a dud.