There will always be people who won't think. The specific problem the OP is noticing, is "promising juniors" who then fizzle out and become these people who won't think. I think this is an interesting category to look at. Is AI making more of the non-thinkers appear promising erroneously? Or is it a comfortable but insidious offramp for the lazy-minded who previously would only think because they had to? Or are the demands of the tech industry, increasing velocity at the cost of conscientiousness, tempting/forcing juniors to use AI to preserve their jobs, but at the cost of their careers?
