But in the case of Brendan, he had recently been exposed as a white supremacist and lost his job when he was enrolled in the study. He was full of regret about getting caught out.
I imagine that this person was already contemplating personal growth, and the drugs just kicked his not-fully-conscious or not-fully=acknowledged feelings into conscious, actionable thought.
I like library providers that can provide mechanical upgrade instructions. For example:
model.adjust(x,1,y)
is nowmodel.single(Adjustment.Foo, x).with_attribute(y)
Or whatever. Then people can go through your instructions find-and-replacing the changes, or even better, have an automated tool do it.
Also you pay some of the maintenance burden by writing all this documentation, so you have a some stake in keeping the changes minimal.