I would try and word it more carefully. The phrase "in production" has serious meaning. I think that's what startled myself (and it seems like some others, too).
Although your take away may have been that everyone should enable it in production. I think every developer should use common sense and practical knowledge when implementing a feature in their application. If you want to use it you should know that having this available for all users is not a great idea, and use it accordingly.
You would be surprised by the lack of common sense in the software community. Maybe even more so in Ruby/Rails. As an example, there are a lot of people running WEBrick in production.