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I think distinction between "effects" and "side-effects" doesn't exist in popular consciousness, so we're well into invention of terminology. Which is fine if you're writing a book and you can define words upfront, but I'm speaking to a general audience in already accepted terms.
It may be argued that a distinction may not exist, but whatever you arrive at, you need a way to explain that IO is as much a side-effecting value as []. Otherwise, you'll end up with another artificial distinction *and* broken students.
I don't see the point in calling something an "effect" just because a functor is involved. If list concatenation wasn't an effect here λ> [1,2] ++ [3,4] [1,2,3,4] Then why it is it an effect here? λ> Failure [1,2] *> Failure [3,4] Failure [1,2,3,4]
I could agree to this argument. I'm just saying you now need a way to say that IO is as side-effecting as [].
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