It depends on your tolerance for error.

When you have a machine that can only infer rules for reasoning from inputs [which are, more often than not, encoded in a very roundabout way within a language which is very ambiguous, like English], you have necessarily created something without "ground."

That's obviously useful in certain situations (especially if you don't know the rules in some domain!), but it's categorically not capable of the same correctness guarantees as a machine that actually embodies a certain set of rules and is necessarily constrained by them.