Since Rodgers in 2005 I can think of only two other first round QB's who sat out the whole season, Palmer in Cincy and Mahomes.
I don't know how your math adds up here, of the nine QB's I listed only two have been injured and only one of those Joe Burrow was injured in an actual game. Watson was hurt at practice. So exactly what point was that?
So are you trying to say Sam Darnold or David Carr were busts because they started as rookies? No they were just busts like Rosen, Winston, Mariota. Hell the odds say two of the top five QB's from this draft will go bust, and it has nothing to do with with starting them as rookies.
When it goes to starting rookie QB's I go with something Payton Manning said...........You learn nothing standing on the sideline, you only learn by doing. Manning had a rough rookie year, his 28 ints is still a rookie record and he said he learned as much from that year as any he has had. Josh Allen another QB who struggled as a rookie who learned from that year, and look where he is at now. Should the Lions have put Matt Stafford in bubble wrap and not let him play his rookie year? How would that have helped his development?