Erythritol can cause digestive discomfort for some [1], which is why I suspect it isn't prevalent.
It was an eye opener to me how many packaged goods have sugar (HFCS) added, when intuitively it seems there was no good reason for any added sweet flavor to be present. By (mostly) assiduously reading the ingredients (the only source of truth, which is why it is often in the smallest print), I am often able to avoid purchasing rubbish that has no business driving me ever faster to a painful death.
There are some goods that are proudly sugar free (on the marketing speak and in the ingredients list) and I make sure to buy these when possible.