When my first daughter was born in 2018, I had a respiratory infection. It lasted three months before I went in to the doctor. I hesitated to seek medical advice because it was clearly viral. But the cough was so bad it was causing the newborn to wake up. The doctor (at a walk-in clinic) told me viral respiratory infections can last months and there's nothing you can do. Just wait. HE gave me some pills to stop the c…
i think the key difference is the incidence rate. if long term symptoms occur in less than one percent of cases, that's still enough for doctors to see and treat without surprise. this article says the incident rate for covid-19 is 25%, which is shockingly high.
To be fair, we're not fully aware of all the cases of COVID. Most likely, many people had COVID but didn't know. Because we didn't have proper testing for a long time, our sampling of 'those who had COVID' is almost certainly wrong