I got the vaccine so I am not concerned about covid. But I remain concerned about catching a common cold or flu because of close interaction. I caught a common cold on the airline to Airventure 2019 and it wasn't much fun. Then apparently caught a different cold on the airline heading home. So two weeks sick.
I didn't catch a cold all of 2020 and don't know anyone that did so there seems some benefit to wearing a mask to prevent colds.
I tried to cover my face on the return flight in 2019 but didn't have a "face covering". Never even heard of such a thing. It wasn't the custom for anyone to wear a mask with a cold then. But I hope it becomes a custom when traveling with a cold to wear a mask. Might be a custom in Asia.