All true! The checklist is only as good as the system that produced it, and that was basically the largest sentence/paragraph in the comment.
Having a forward-looking industry working in symbiosis with its top-notch quality high-functioning regulatory environment is the ideal state. It's rare. (I would say it's apprecition is academic only today. State-capability (or "state capacity") is getting to be a buzzword now for pundits[0][1][2][3]. But it's not that surprising that these problems seem to be cropping up now, in the Internet era, and not during the Cold War.)
My theory is that having a basic regulatory environment allows for increasing industry-wide quality effectively and quickly. For example the CDC is bad at counting COVID cases[2], but catching blindness causing eye drops with "just" ~70 cases countrywide[4] is a good example of the basic safety net.
Similarly, the whole aviation industry's safety process and context was what allowed the MCAS fuckup to come to light fast.
"Fun fact" regarding MCAS. If I recall correctly Boeing argued that the MCAS malfunction was covered by the runaway stabilizer procedure (checklist!), the astronomically bad UX of MCAS itself is what made pilots confused. (Because it activated for 10 sec every minute or something WTF like that, so they had no idea they need to get the runaway stabilizer checklist.) And that's exactly what you're saying. It wasn't sufficiently 737-like.
The workaround is to add UX to these type similarity checks done by the FAA and other regulatory bodies. And, again, exactly as you have mentioned, the cost-benefit discontinuity led to this bad trade off. And while we can't magically smooth over all of them, but at least (and that's my argument) we have good frameworks to start looking at them, detect, recognize, analyze and workaround them. (And checklists are the level 1 of these tools.)
[0] https://marginalrevolution.com/marginalrevolution/2020/01/wh...
[1] https://www.youtube.com/watch?v=zT-McydDEx4
[2] https://www.slowboring.com/p/the-cdcs-vaccine-data-is-all-wr...
[3] https://en.wikipedia.org/wiki/Why_Nations_Fail (but see also "The Narrow Corridor")
[4] https://www.nbcnews.com/health/health-news/recalled-eyedrops...