No I understand what you're saying and I agree. Goff is the type of QB that can help pull them out of the basement and maybe make the playoffs in a year or two. But he is not good enough to win a super bowl. He doesn't see the field well enough, and he struggles to maintain accuracy and make big plays with pressure around him in the pocket. There is no way we win the super bowl last year with Goff at QB you are 100% correct.
But the question for the Lions and maybe 15 other teams in the NFL is, if you dont feel your current QB can win the super bowl, when do you try to upgrade and find someone who can? Being complacent with just making the playoffs or maybe winning the wild card round doesn't do you any good. Because when you reach the conference championships or the super bowl, you will likely be going against Mahomes, Allen, Brady, Stafford, Burrow, Herbert, or Wilson (the elite qb tier IMO). Or maybe a qb from the tier below that had a great year: Kyler, Watson, Lamar, Carr, Matt Ryan. With all the draft capital the Lions have, if they dont think Goff can win the super bowl they have to draft someone.