Dr Jeff Gilchrist is a Canadian adjunct professor and has written this thread about the effects of Covid on the immune system:
pingthread.com/thread/1605958004163084292
In summary, there is evidence that Covid affects the immune system, making people more susceptible to other infections. Research is ongoing and other researchers are coming up with similar results. This is in addition to the long-lasting effects Covid has on multiple organs. This is also happening in Sweden, where there was no lockdown, so questions the idea of some kind of immunity debt.
It will be years before the long-term effects of Covid are known. With no official "rules", my personal view is that I want to avoid Covid, if I possibly can. Rates of infection, including hospitalisations and deaths are increasing in my area and I can't think of anything which is worth putting myself in a risky situation. If I had symptoms of anything infectious, I most certainly wouldn't want to put other people at risk.