What is your view of obvious ideas in a book?

I came up with a very good book idea but looking back, I feel like my ideas are so common sense that a smart person might think I am insulting their intelligence by writing it. The book is designed for people who lack common sense and need a reminder cause a very smart person might think I'm babying or coddling them with very very very basic ideas. I have seen reviews on Amazon where readers complained about how predictable and easy a book was.

What is your view of obvious ideas in a book?
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