I guess that's a good point, but I think of the flu as different symptoms, you are really fatigued, you have brain fog, feel a bit like you are at the brink of death, have headaches, and you're caughing, maybe with a sore throat and more difficulty breathing.

Whereas colds are more congestion with drowsiness.

But you're totally right, symptoms alone are hard to use for accurately knowing what you had, there are so many types of cold virus and bacteria out there too.

I guess for me, I had never had the symptoms I describe in the former, until a few years ago I did, which I thought of as getting the flu. Had it been early 2020, I might have wondered if it was Covid, given the description of symptoms.