And yet I've seen it catch real bugs in real code.
Sorry, but you'll have to explain to me how testing that perl can load a module detected a bug, that you would have missed by allowing perl to report:
Can't locate object method "new" via package "Some::Module"
(perhaps you forgot to load "Some::Module"?) at...
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.