That's a strange argument. Rodgers is a great qb who didn't get sacked 50 times. Well, you made my argument. Who the hell knows what would have happened if everyone did the opposite? I sure don't.
The fact is, Couch and Carr were #1 overall picks who did get sacked a lot and didn't amount to much. Rodgers was a #24 pick who did.
Sacks are an indicator of not being up to speed [throwing away if in trouble a sign of maturity]. Sacks are also factors in developing bad habits, loss of confidence etc.
Stating the obvious, there are a lot of factors beyond a prospect's control that can contribute to determining how well and quickly the prospect develops into an NFL player, and whether or not he does so at all.
Owners have played an enormous role, since, for many teams, they are effectively the decision-makers on 1st-round selections in general, and especially QBs. They'll often insist on taking a prospect due to his pre-draft acquired fame (puts fannies in the seats), whether he's a scheme fit or not, and then insist on having him start immediately, whether he's ready or not.
I know of at least one team that (long ago) drafted a running QB out of college (in the top 10), at the owner's insistence, because he was the Heisman winner. And then the owner insisted that he start as a rookie in an offense that required him to be a pure drop-back passer, even though they had reasonably adequate, experienced drop-back passers already on the roster.
It didn't go well. Bad habits became ingrained. The player obviously lost confidence in himself, ended up injured a lot, and was out of the league within five years.
And, it didn't help that this owner also regularly dictated many other football decisions over the objections of knowledgeable coaches and FO personnel (who, not surprisingly, didn't usually stick around very long).
The point being that a team that is willing to allow a 1st-round QB to carry the clipboard for a couple of seasons in order to learn the pro game and develop the required skills is probably one that's better managed to begin with, has better consistency and continuity, and one that's run by "football people" for football reasons rather than impatient ego.