I'd take it with a grain of salt at least in terms of personal experience.

It's kind of like how science-based lifting is spreading among the bodybuilding community. Is it useful? Absolutely. The issue with it as general advice is that most people don't know how to properly utilize it by missing basic concepts like applying appropriate intensity with solid form.

I don't have to floss in a perfect scenario, but maybe my technique is wrong. Even if I floss after brushing, I'll still find food lodged in between tight spaces. In this case I just floss because then I can at least remove that doubt.