> The legacy of BASIC on our industry can hardly be understated.
The expression you're looking for is “the legacy of BASIC on our industry can hardly be overstated.” You're trying to say its legacy is huge; whatever anyone says, it won't be an overstatement. If it “couldn't be understated”, however insignificant one said it is, that would still be true. That wasn't what you meant, was it?
(And yes, that means user emptiestplace’s comment didn't deserve to be downvoted into oblivion.)
The expression you're looking for is “the legacy of BASIC on our industry can hardly be overstated.” You're trying to say its legacy is huge; whatever anyone says, it won't be an overstatement. If it “couldn't be understated”, however insignificant one said it is, that would still be true. That wasn't what you meant, was it?
(And yes, that means user emptiestplace’s comment didn't deserve to be downvoted into oblivion.)