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You learn by doing.. eg typing the code. It's not just knowledge, it's the intuition you develop when you write code yourself. Just like physical exercise. Or playing an instrument. It's not enough to know the theory, practice is key.

AI makes it very easy to avoid typing and hence make learning this skill less attractive.

But I don't necessarily see it as doom and gloom, what I think will happen - juniors will develop advanced intuition about using AI and getting the functionality they need, not the quality of the code, while at the same time the AI models will get increasingly better and write higher quality code.