> As the verification process itself becomes automated, the challenge will move to correctly defining the specification: that is, how do you know that the properties that were proved are actually the properties that you cared about? Reading and writing such formal specifications still requires expertise and careful thought. But writing the spec is vastly easier and quicker than writing the proof by hand, so this is progress.

Proofs never took off because most software engineering moved away from waterfall development, not just because proofs are difficult. Long formal specifications were abandoned since often those who wrote them misunderstood what the user wanted or the user didn’t know what they wanted. Instead, agile development took over and software evolved more iteratively and rapidly to meet the user.

The author seems to make their prediction based on the flawed assumption that difficulty in writing proofs was the only reason we avoided them, when in reality the real challenge was understanding what the user actually wanted.