Okay, I'm not a physician, but for me as a layman there does not seem to be anything new in the study described. Yes, not taking it without indication has always been the professional recommendation. Stopping Aspirin treatment can also increase the risk of a stroke, so the treatment shouldn't be stopped without medical supervision.

I'm wondering whether there is any example of a medicament or artificial supplement that is recommended to be taken without indication. I've never heard of something like that. Vitamin supplements should be replaced by more healthy nutrition and maybe more fresh air, more sun, and doing some sport. If there is no diagnosed deficiency, then supplements have no benefits at all. Most of the "daily supplements" you can buy in a pharmacy can be replaced by occasionally drinking a glass of orange juice, eating a banana, or eating something with honey. I once went to the pharmacy when I had a cold and didn't check what they were giving to me very carefully. At home, I realized that I just bought some pills that contained traces of honey... at a price of 16 EUR!