Hopefully those with complications will turn out to be a minority but we are talking a disease whose parameters haven't been fully discovered.

The "magic" of COVID is that combines the seriousness of many serious diseases, like more conventional viral pneumonia, that do long lasting damage with an infectiousness greater than the flu - so even minority with organ damage can be many, many people. It's not the worst disease in the world but the point one should be concerned with the number of cases rather than just fatalities.