No one is claiming expertise is permanent. But some people know more things than others in select topics. And no one is perfect but someone who has more knowle

No one is claiming expertise is permanent. But some people know more things than others in select topics. And no one is perfect but someone who has more knowledge and has spent more time studying a thing is more likely to get it right. You can cherry pick examples and misuse tools or you can look at the very basic facts that the people who study things for a long time no more about those things. For example, asking a doctor for health advice is more reasonable than asking random people for health advice.