Well, until medical sources/experts definitively establish that once one catches the virus and recovers then as a result the person's immune system has developed antibodies sufficiently so that one will not, or is not very likely to, catch the virus again, then we should all proceed with an abundance of caution.
Can't believe that the COVID testing will be a panacea or that useful of a tool either, until advances in testing procedures and in other areas are made. To me, the current testing is just a "snapshot" at a point in time. You could get tested and later find out the results are absolutely NEGATIVE. Yet 5 minutes after being tested you could walk out of the testing area and come into contact with someone with the virus and possibly be infected. Until testing is improved so that one can almost INSTANTLY find out if they are infected or not and until a truly effective vaccine is developed, the current situation regarding this virus is going to continue, waxing and waning, in both the severity of the disease and the frequency of its occurrence and in its effects on human activity!