Exactly. Hair and scalp. Evolution already made a MIPS system. The thing lacking it was the test dummies that Virginia Tech uses, so now they recommend we put it in helmets too.
My Lazer Genesis Helmet is a MIPs and it’s the lightest helmet Lazer made at the time.
Much more breathable than my previous helmets too.
Sure, buy all the safety equipment you can afford that has any possible benefit.
What’s better: a $15 more expensive bike light or a $15 more expensive helmet with MIPS?
How are they testing it in the lab? How do concussions work in realistic situations (is there one way?)? What is the distribution of realistic situations?
Maybe the benefits are better in realistic situations; maybe the lab tests are more aggressive than reality or the results are interpreted conservatively (because scientists spending years on something might have thought of a 30-second hot take), ...