If I go to a topic I haven't been to before, my reputation doesn't follow. No complaint--system can't tell whether I know anything about the topic.
But if I do know something, and I see an "answer" that's false. I can't comment on it. Yet I am allowed to post an "answer."
I know that I could wander around and provide some answers and build up the required fifty points, but that won't occur to everyone, and it's awfully hard to leave a falsehood uncorrected.
I don't understand why someone who can't be trusted to comment on an answer can be trusted to provide an answer. And I suspect this results in a lot of "answers" that are not really answers.