"The legend about a low-level employee who pipes up with a shockingly brilliant yet simple suggestion that either makes or saves his employer untold millions of dollars has long been part of the canon of business legends."
I used a 20 dollar pen cam off eBay for diagnostics once, avoiding tens of thousands in diagnostic downtime needed otherwise and found a root cause of an otherwise undetected massive failure mode. All because the blasted thing fit. (Full disclosure: the idea started with a plant tech who wondered if there was an application for the pens - research and testing later showed it safe under our operating conditions (a small explosion was possible).)
It's a rare opportunity, but magical when it happens (and modern, cheap tech is magical for heavy industry).
I like another poster's point that even if it's not real, it's still useful as a parable, so your link to more is appreciated!
That said, operators tend to be masters of their section, but do not often have a comprehensive high-level view (excepting relief operators, who need to have a good idea of the whole process to cover multiple positions). As a result, I treat their input as a deposition or raw data/evidence: pure, unfiltered signal. Some interpretation is likely needed to make it fit into the overall whole of the process, but it's miles away better than guessing or just trusting assumptions!
Process engineering is a comprehensive and collaborative field. Leave operators out, and you're just not looking at the process. People matter. A lot.