I highly doubt the CDC would allow immunocompromised people to be vaccinated if it may be unsafe and likely ineffective.
From the CDC website: “Immunocompromised individuals can receive COVID-19 vaccination if they have no contraindications to vaccination. However, they should be counseled about the unknown vaccine safety profile and effectiveness in immunocompromised populations, and the potential for reduced immune responses and the need to continue to follow all current guidance to protect themselves against COVID-19 (see below).”
Many immunocompromised people are already in protected environments such as a hospital.
I don’t think this is true. There are plenty of people undergoing chemo treatment in outpatient settings. That’s just one example.