>More than 10,000 novel variant sequences are currently discovered every week and human experts simply cannot cope with complex data at this scale

I suspected something like this, given the frequency of viral mutation. Officials announce a dominant global strain but what proportion of positive cases are actually sequenced and evaluated for confirmation? How many undiscovered strains are actually in circulation at any given time, in geographically isolated areas? Could that explain variability in severity and/or long covid?