Since open source is free and open, it really can't fuck you †. You can however screw yourself by relying on it to do your work for you.
As you say, few people have the skills, time and desire to fix these sorts of problems, and that means you can't rely on open source to fix them for you.
Fortunately, there is a simple solution to this called "money" which companies have and which can be given to a developer with the skills who will magically convert that money into the time and desire to fix the problem.
† If your company is willing to use open source, but only when it is perfect, and not willing to help improve it, maybe they are the doing the fucking?
Being the lead dev of a fairly well used open source project I can say for certain that too many people I've had interactions with that want a bug fixed or a new feature added do so with entitlement. As if by not doing it they're being told to fuck off.
I may have dramatized it a bit but there's something about software that people feel entitled to get value at no cost.
I never said that someone like you were telling people such things by not doing what they request. I'm describing people who's immediate reaction to almost anything is "only contributors may complain!" and if you don't fit that category then good for you. That means I'm not talking about you.
If someone submits a bug report or feature request that you feel you cannot get to in a timely manner or don't feel is necessary then you can politely explain why. If the person responds to this with an entitled attitude then the problem then lays with that person, not you. If you respond to a bad attitude with a bad attitude then what picture are you painting to everyone else?
It's classic customer service, you are polite to everyone but firm in your decisions. No one says that you must cater to every single person who says anything about your software, but you should be polite in saying no. How you say no provides a much clearer picture of your project than how you say yes.
But the idea of "being fucked"  implies some level of entitlement or deserving something.
Providing feedback is very useful for open source projects. But there's a fine line between providing feedback and feeling like you're getting a "fuck you" when it's not implemented or fixed.
 > This is the classic open-source "fuck you with a smile" response.
When you say someone is "being fucked" by an open-source project I see that as the project itself, or the people on the project, causing a significant problem for the person involved. In fact, I would say that such a strong term means that the the detrimental aspect is likely intentional. The project itself is causing a negative action to that person. This is not what I'm describing.
When I say the response is "fuck you with a smile", there's no detrimental action involved. I see it as a very impolite way of saying no. The person receiving the response can ignore it or choose to go somewhere else, either way there's no real negative action being done to them. All I'm saying is with that response I would assume most people would choose to go somewhere else.
Again, this issue isn't whether someone acts with a sense of entitlement if they complain that their suggestion or bug report isn't implemented. As I said before, if someone whines in that instance then the problem is with them, not the developers. On the other hand, if someone makes a statement along the lines of "this feature doesn't seem to work right", or "this bug prevents me from doing something I want to do", or "it would be nice if this feature was implemented" then responses like "only contributors can complain!" or "learn to code and fix it yourself!" are developers using the "fuck you with a smile" response. I feel that is wrong and not productive in any way. It is actions like this that will push people away from the idea of open-source software because who wants to deal with that nonsense?