Classic misunderstanding of programming languages. The only thing stopping cobol from being "known" is these companies paying for it.
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Not moving forward with the software industry is a weird kind of conceit that separates these companies from the mainstream by far more than money.
There's a comment in this thread from a former consultant that completed a 4 week COBOL bootcamp before being sent to a client to write code!
Why is this input file loaded and rechecked 3 times? Because 30 years ago a file load failed, breaking end of quarter reports. This was the fix: if we can read that file three times and it doesn’t change then we know it’s good