The main goal of this article is to make Developers understand some of the basics of machine learning, not to make everyone think they can be an expert data sci

The main goal of this article is to make Developers understand some of the basics of machine learning, not to make everyone think they can be an expert data scientist after reading just this one article online. This is also stated clearly throughout the article, as there are no golden rules for finding good features, getting the data right, etcetera. Given this I don't think you should be worried about this. Additionally lots of testing and validation mechanisms and people are involved in complex systems that you state to be concerned about.