By and large, yes. It's never the best solution and it's no substitute for proper tests. The only other scenario I can think of is one of those urgent cases we all get where functionality needs to be added at short notice and refactored later - it could be handy to make sure that the refactored version produces the same result.
I've actually pulled it out into a package if you want to play with the concept- it's at packagist.org/packages/matthewbdal...
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