There's a lot of things in what you're saying that people have incorrectly passed to one another to minimize illnesses & COVID in particular.
1) Sars2 mutates at a higher rate than influenza, by a lot. This happens because of two reasons, it's size is much larger, making it error-prone. The second being coronaviruses are naturally resistant to many antivirals because of their error correction process called proofreading. Influenza doesnt have this. This allows better propagation.