The reason to take this seriously is mentioned in the article: It is possible to OD on Tylenol, and when consumers miss the fact that these drugs are all just Tylenol+junk, they might believe they need to take several of them together to get well.

It's similar to the shampoo example (a huge selection of borderline useless products that make money purely because of marketing) but with a minor safety consideration, too.

Especially when the phenylephrine they took doesn't fix the problems the box promised to fix.