But in recent years I have seen people (elsewhere, not on HN) claim that Y2K was a big nothingburger, and all the money spent on fixing the bug was wasted. No, that's not true either. All the money spent on fixing the bug was why it turned into a big nothingburger. Sure, some of that money was wasted, by executives who wanted an "official" Y2K-certified certificate, issued by a consulting firm that had nothing "official" about it except their own say-so. And so they spent $2 million learning what their own employees could have told them for $2,000. THAT money was wasted. But a lot of banks were running old COBOL code that used 2-digit years, and needed to be fixed. The fact that in January 2000, everyone's bank interest was still calculated correctly, and not calculated as if it was January 1900? THAT was entirely due to the vast amounts of money spent paying old COBOL coders to come out of retirement and fix the 2-digit years.
The lesson I learned from that is that it's possible for a problem to be overhyped, even massively overhyped, and yet still be a serious problem. The other lesson I should have learned is that people rarely get credit (I won't go so far as the article authors and say "nobody ever gets credit") for fixing problems that never happened.
The assertion may have been unfounded, but I think it's just as unreasonable to assert the opposite. Bugs have cascading effects and in a sufficiently complex piece of software they can create chaos with unpredictable outcomes.
I earned my first house deposit helping the team fixing the water and gas company in Wales, UK. Their entire system was running off a set of COBOL programs on a mainframe, none of which had been properly documented over the years, and the whole thing used 2-digit dates. It would have caused actual deaths if not fixed; everything would have shut down, and no water and no heating in a British winter is potentially lethal. And then it would have sent everyone in Wales a bill for 100 years of water and gas.
They were bribing retired software devs to come out of retirement with huge stacks of money, because that was cheaper than training new COBOL devs and getting them familiar with the spaghetti system.
It worked, no-one died, life went on. So obviously it was all fake rolls eyes