There are very few helmets with chin guards on that list. I struggled to find some for my kids. Bicycle safety culture is so weird, it’s obvious some face protection is needed but it’s not fashionable.
In the PinkBike video, they mentioned that the full-face helmets didn’t perform as well in at least the rotational impact tests due to their higher mass and moment of angular momentum.
I think it always ends up being a bit of a trade-off, depending on the types of riding and impacts expected. In a low-speed impact to the side of the head a regular bicycle helmet will often do better than a big heavy motorcycle one. Obviously the opposite is true for a motorcycle crash at 80 km/h.
Full face protections is fashionable in the Downhill circles. But here we come to the caveats of the full face helmets. A) they are heavy and B) they breathe much less. In other words they aren't that comfortable to wear outside of when you really need them. If you want full face helmets for your kids there are out there but you will have to look at Downhill miountainbike ones. With a price that matches...
Did a quick search through their database for "kid", "child, "junior" and "teen". No results. They haven't got to testing that market segment yet.
It doesn't seem like the author of the article did any basic statistics to prove this point? What is the R2 and P value of these scatter plots?
Are these even linear relationships?