On the flipside, in the olden days when one set of people were churning features and another set of people were given a black box to run and be responsible for keep it running, it was very hard to get the damn thing to work reliably and the only recourse you often had was to "just be more careful", which often meant release aversion and multi-year release cycles.

Hence, some companies explored alternatives, found ways to make them work, wrote about their success but a lot of people copied only half of the picture and then complained that it didn't work.