we cannot gamble with our future so carelessly on the basis of preliminary data. here is a vignette to explain why.
once someone is infected with HIV, most people experience flu-like symptoms for a week or two which then resolve either with or without treatment. in some people, the virus is cleared so effectively after the initial infection that they will test negative for HIV. then, over the span of months and years, their immune system is silently and entirely asymptomatically destroyed, leaving them none the wiser until they progress to AIDS and get extremely sick.
COVID hasn't given us any indication of similar activity. but we know so very little that we can't take the risk, especially not with millions and millions of people. i will also note that we are unlikely to rule out these kinds of hypothetical risks anytime soon. so caution is our only defense against disaster.