Well it is an issue because there's a shortage which is affecting healthcare. Healthcare workers are more exposed but they also have others helping them to protect them such as removing exposed protective gear for them. If they get sick, the less of them there are to then help each other. That means the more likely they'll be removing gear on their own thus increasing their exposure. What I've been talking about are the odds. Healthcare workers have higher odds at being exposed. Civilians that just buy masks for themselves and their family just as a precaution, their odds are low. It gets worse if the outbreak gets worse and just wearing masks are not going to help that. Even with asymptotic people, I bet most people that wear masks are going to take it off when they're about to sneeze or cough so their masks aren't doing anything. If people are that scared of exposure, why are they going out in public? The only way a civilian that goes out in public can protect themselves is to wear a hazmat suit and then have someone at home when they get back wearing protective gear while spraying them down with disinfectant and removing their gear and then someone will have to do it for them. Other than that a civilian has virtually the same chances of being exposed as with someone not wearing a mask. Just taking precautions that don't require wearing a mask are better.
I totally agree front line workers and patients in hospitals and sick at home and their families get the priority. Staying at home right now is a very sensible thing to do to flatten the curve.
What I'm trying to say here is practical matters that "if" someone has to use a face mask regardless, not the hypothetical extreme ideal world where everybody has the bio hazmat suit and don't need to go out at all for extended period of time.
With or without face mask, what's reasonable and practical is up to each person's knowledge, judgement and circumstances.
You have to balance out risks and benefits and make a call on the odds. I don't mind people not using masks, at the same time don't take exceptions to those who do ware, especially when they have underlying health issues.
It's a gradient of grey, not black and white.