This [1] is a great article that I think gets at this topic a bit. Basically, germ theory and anesthesia (ether) were both discovered around the same time. Yet anesthesia spread around the world in a matter of years, while germ theory is still a struggle for doctors and hospitals. I presume the reasons checklists are underutilized are similar, lack of immediate consequence, low probably of consequence, and added difficulty instead of simplifying things. We must do better.

[1] https://www.newyorker.com/magazine/2013/07/29/slow-ideas