Yes, we ration medical care because it's expensive you can't go to ER and get an MRI to check for an aneurysm every week for free, even though that would save a few lives a year.
Things are recommended and paid for insurance only if they are safe, effective, and meet some cost-benefit threshold. This threshold is normally quite low, especially in the US, and we collectively pay (through insurance pools and government subsidies) for lots of things here!
If you argument is that "its too expensive to cover COVID vaccinations for mothers" then say that!
Plenty of things are not covered because of cost-benefit and we as a society have to make, partially qualitative, choices about what to cover!
Here I am critiquing the qualitatively driven decision to reduce access to the COVID vaccine. I think the data support continuing to force insurers to cover it!
Pharmaceutical pricing is by-and-large not exploitative and and hand-wavy argument that pharma should just charge less so everyone can afford everything is just Marxist wishing.