Honestly, I don't see how you're adding anything here other than inflated expectations and a strange anti-individual pro-mega-corporation ideology.
Fundamentally your post boils down to this: All contributions should be self funded by the person making them.
This might seem acceptable at first glance, but it has some really perverse implications that are far worse than making a product customers are willing to pay for.
To be granted the right to work on an open source project, you must have a day job that isn't affiliated with the project. You must first work eight hours a day to ensure your existence, only after those eight hours are up, are you allowed to work on the open source project.
Every other form of labor is allowed to charge for money, even the street cleaner or the elderly janitor stocking up on his pension, everyone except the open source developer and that everyone includes people who work on behalf of a company that directly earns money off the open source project, including software developers hired by said company even if those software developers work full time on the open source project. This means that you can run into absurd scenarios like SF salaries being paid for contributors, while the maintainer, who might be happy with an average polish developer salary doesn't even get the little amount they would need to live a hermit life doing nothing but working on the project. No, that maintainer is expected, I mean obligated, to keep working his day job to then be granted the privilege of working for free.
Somehow the maintainer is the selfish one for wanting his desire to exist be equally as important as other people's desire for the project to exist. The idea that people value the project but not the process that brings about the project sounds deeply suspect.
Your complaint that prioritizing paid feature is bad is disturbing, because of the above paragraph. The maintainer is expected to donate his resources for the greater good, but in instances where the maintainer could acquire resources to donate to the public at large through the project itself, he must not do so, because he must acquire the donation resources through his day job. To be allowed to prioritize the project, he must deprioritize the project.
The strangest part by far though is that if you are a company that produces and sells proprietary software, you're the good guy. As I said in the beginning. This feels like a very anti OSS stance since open source software is only allowed to exist in the shadow of proprietary software that makes money. The argument is always that certain types of software should not exist and that the things that are supposedly being withheld are more important than the things being created.
I personally think this type of subtractive thinking is very insidious. You can have the best intentions in the world and still be branded the devil. Meanwhile the devil can do whatever he wants. There is always this implicit demand that you ought to be an actual devil for the good of everyone.