Unlike what you say, I think the real issue is people who have been studying something for a long time still being wrong about a subject. It’s not uncommon in any human endeavour. You can go to the gym for 20 years and never make any gains. You can also play badminton for 20 years without ever learning some essential strokes. You can study any subject without learning, it’s the default setting actually.

This becomes problematic since low quality experience is easily used to make arguments from authority with very high confidence.