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I think it's the leap from - 'I'm not a fan of the approach' to 'this is a poor textbook'. Just because they don't like the approach doesn't mean it won't be effective for other learners. Some people absolutely need examples before they can attach anything theoretical to a concept.



Yes, the wording in that comment is not very friendly.

Also, I think that examples motivate people. I'm sure a lot of people are capable of understanding highly abstract things, but motivation is key.




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