One thing that puzzles me: why did people focus on swabbing the back of the nasal cavity, which is a difficult and unpleasant task and unlikely to be carried out properly by untrained people (especially when one does this to oneself)? Why can’t you just cough sputum or swab the throat?
For that matter, why can’t particulates from the lungs be exhaled (or coughed, perhaps more than once) into a collection device (like one of the air filters in aerial microbiology, or this thing) and tested? Why can’t such devices be used in public spaces to monitor air quality, or used in hospital ventilators to monitor patient progress? I will bet anyone a bottle of hand sanitizer that this will be more effective. Tests that are easier to do are less likely to be screwed up.
If one captures DNA as well as RNA and uses whole metagenome sequencing methods, one can profile many different viruses and other aerial organisms. It might even be possible to identify if other microbes (bacteria, fungi, archaea, other viruses) are contributing either to symptoms or lack of such in patients, and coughing into a filter is less intrusive than a nasal swab.