[ysavir]

I think the parent comment is referring to the act of submitting code changes to Rails directly whenever behavior is needed. Staying up to date with what your dependencies are doing and why makes sense for any project, but actively contributing to the dependencies isn't necessarily a great investment when it doesn't benefit your bottom line in a direct and timely matter. Github has a large enough staff that it can dedicate time to open PRs to the Rails repo without giving up its own productivity, but if you're looking at a team of 10 developers, taking time away from your own product to improve Rails can be a significant time cost.