Don't believe everything you read online.
My experience from actually having 2 kids currently in high school is that failing is damn near impossible, but GPA absolutely does mean something for most kids. There is definitely a group of kids at the bottom that in decades past would have been held back or dropped out and those kids are now just passed along. Is that better or worse than having them drop out? I don't really know, but the reality is that those kids likely wouldn't have been cut out for these jobs anyway. At the other end of the spectrum, the competition at the top can be fierce. My kids and their peers stress way more about their GPA than I ever did because competition for colleges has gotten tougher. The education is there for those who want to take advantage of it.