When you mention you can't imagine a single negative aspect, I presume that you are not a low income minority without a credit/debit card? Cash is more convenie

When you mention you can't imagine a single negative aspect, I presume that you are not a low income minority without a credit/debit card? Cash is more convenient for many (especially nearly the entire demographic of Hacker News), but the point of the article as you may have noticed is about how a large percentage of low income people and minorities do not have bank accounts and thus are not able to shop at these establishments. Hopefully someday states can help solve these underlying issues and then we can live in a world where payments are more convenient for all.