Yeah I dislike this thing where so many "articles" are just a page-long introduction to a discussion in the comments. I always get to the end of the "article" and start looking where to click for the next page of it but that's it.
I won't make the same mistake by responding to the article's points. If and why savings rates have gone down from the 80s is a big question and deserves a thorough thought process. Same for . . . whatever point she's trying to make about 401ks.
But I will say I agree with the point about not everyone getting rich from not buying lattes. While small spending makes a big difference, a lot of people have already shot themselves in the foot by buying the wrong car or too much house too far from work or even getting the wrong degree. Perhaps pop personal finance is too one-sided. Hey, you can make a lot more money selling books to people telling them their problems have easy solutions.
Also the latte debate can derail discussions we should actually have about things individuals have less control over like catastrophic medical issues and whether and how we can work together as a government to improve the situation.
Looking, at the comments, it seems like others are making similar points.