@nshephard @faassen @inthehands @grimalkina @jenniferplusplus I think it shouldn't be taken quite so literally, but my understanding is that's kind of the point. "Best practice" is supposed to mean that, to the best of your ability to determine, you are doing the thing in the best way it can be done.
The alternative is that you know of a better way it could be done, but you're not switching because you think the existing way is good enough, or because you don't have time, or don't care, or whatever. And I think that can sometimes be okay, but it's also not hard to imagine how it could go very wrong. Whereas if you're using the best practice, it can't really be argued that you should have been using a different practice instead which would have prevented the thing from going wrong. If that argument can be made, then it's essentially saying you weren't actually using the best practice.
(Of course the definition of "best" and "better" is often very sensitive to context)