What you’re describing is that in response to a resource being rationed you are able to use money to raise its urgency at your will. That seems like a powerful option to have when your health is on the line (that I acknowledge is not available to everyone).
I don’t have metrics for good/bad. I’m just going off of them telling me it’s bad.
To be clear, that's in the US where we have private health care thus it generally isn't rationed provided you're willing to pay. However what we have is a guild system that in effect tightly constrains the total supply. Depending on the state one of the ways that urgent care commonly gets around this is with ever controversial nurse practitioners. Which is to say that quite a few state legislatures appear to be pushing back against the guild.