You are absolutely right, despite their efforts they haven't had more success than the Cowboys ever since the 90s. But this thread is more about the current culture in either team. It seems like the 49ers are closer to winning it all than this team.
But I stand by what I said in countless other threads. Playoffs are a tournament, it's not necessarily the best team on paper winning it all. Daily performance, luck, momentum, "getting into a rhythm" and all that can erase talent differences easily. What I'm saying is, we "just" need four good days.