Historically speaking, countries have refrained from forcing even medical workers and people caring for the elderly to get flu vaccines, even though this argument - that there are some people for whom the vaccine will not be effective - is even more true of that (in fact, as I understand it some studies suggest the flu vaccine might be basically ineffective at preventing serious complications and death in those at risk of them, leaving its ability to stop people from being infected and spreading it as the only way to reduce risk). As far as I can tell, the only reason to treat Covid differently basically boils down to partisan politics...