Generally speaking, when somebody wants other people to adopt a practice, they make sure that practice is fit-for-purpose themselves rather than expecting the p

Generally speaking, when somebody wants other people to adopt a practice, they make sure that practice is fit-for-purpose themselves rather than expecting the people to whom they advocate to stop using things that are fit for purpose, then adopt something unfit-for-purpose, and then fix it. Your implication that lots of open source communities have historically not done that is absolutely true. But also it's why people don't want to talk to them much, too.