Grant tolerates a little but thinks unlimited magic is cheating, because once anything is possible any contrivance can resolve the plot. It is his main objection to Murakami.
Where it appears 2

don't pretend you aren't confusedThe genre Tyler names on reading Murakami's 1Q84.
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Once you open up these possibilities, then anything's possible, and any kind of silly contrivance to help you figure out your ending is possible. I think that's cheating.
- Unlimited magic is cheating
Once a story allows anything to happen, any contrivance can rescue the ending, and dramatic tension disappears.