There are ways to speed up wine fermentation and aging. It is drinkable; but it doesn't turn out as well as wine that is allowed to take its time.
I'm convinced that it is the same with rookie QBs. Just because they can manage to find a way to hang in there, and even do OK, doesn't mean that it was the best course of action. Some of Luck's recent struggles can, I think, be traced back to not being given any time at all in his rookie year to carry a clipboard and learn. Too much too soon even if there was some relative success.
And Goff does not have quality WRs to throw to that can bail him out. Indeed he does have good RBs, which will be helpful.
Does he have a good enough Oline? Time will tell (actually I'm fairly optimistic that the Oline will do pretty well this year).
Does he have good enough OC? Gulp. We'll see.
But I'm one that doesn't want to see him start just because some fans and media will start throwing around the "bust" label if he doesn't start game 1.
He's very young; and he doesn't need to go out there and have bad days when its not necessary. We have other options.
If Keenum remains clearly ahead (heck, if Mannion does, for that matter), start them and let Goff keep learning and acclimating.
Look at the difference 1 year has made for Mannion......and he didn't play in his rookie year.
Believe me, if Goff is about even with Keenum and Mannion at the end of training camp, fine.....start him.
But not if he is clearly not ready.