I have done a lot of open source and I disagree. The problem being that as a maintainer, I refuse most contributions. Not only because they are low-quality (it happens), but also because they are often out of scope, or I just disagree with the direction. It's my project, I maintain it, I choose what goes in it. But you're free to fork it with your changes, that's exactly why I made it open source. If you make an inte…
Surely the value of patching upstream is so you don't have merge conflicts for eternity?
But my experience has been that most managers are not competent in that regard. If you have a good manager that understands that, then that's great. But it's rare. Most of the time, it works better to bullshit them with the legal consequences of not allowing you to upstream your changes.
Again, that's my experience.