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I don't think it's simple. I find lifetimes especially challenging. I love rust, but sometimes I am remarkably unproductive in it because the compiler is so strict. Honestly, sometimes I think I need flash cards for memorizing how to deal with particular compiler errors.

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Lifetimes are an interesting illustration. They are conceptually surprisingly simple (they draw regions in time and check if one region is clearly smaller than another), but as a language feature very weird, as they are essentially a declarative language in an imperative setting. A lot people struggle with them more because they can't really _place_ the feature rather than applying it.

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