That study gave no causal reasons. In particular, there was no effect on number of surgeries done. It's just as possible that research-oriented doctors go to the conference, and those doctors are worse at performing surgeries.

Isn't that because a surgery, if it fails, will result in the patient dying immediately, rather than some random time later? If you do more surgeries, you will increase both the failed and the successful surgeries, whether your success rate is 10 or 90 percent.

Compare: "bomb explosions tend to increase around the time when we send in the bomb squad. I guess bomb defusing is pointless."

IOW: Surgeries and bomb defusing tend to move forward a lot of the death-probability-mass (while, in theory, destroying some of it).

This is interesting. Do you have a source for this?

Yep. "Move fast and break things" is immature and inappropriate for anything that purports to be reliable. It's fine for toys like social apps, but for serious actual grown-up applications it's a juvenile hindrance.