@StormyDay I don’t see anyone touting any safety equipment (helmets, air vests, or anything else) as a magical cure that will eliminate all horse riding injuries?!
MIPS is designed to help in side impact situations - I cannot think of the last time I, or anyone I’ve seen, has fallen and not had what I would consider a side impact if their head touched the ground.
I had the EQ3 for 3 years and just replaced it (after a fall) with a Lynx and the Lynx is an even better fit for me (probably due to the dial to make small adjustments), has a more flattering profile, and I think it is a little cooler. If you can find a MIPS helmet that fits, there is no downside to one with MIPS compared to one without.
Air vests were mentioned upthread. I remember when they came out and I never heard anyone mention the idea that they would replace standard body protector vests for eventers. They were an additional layer of safety and I can say from both my own experience and watching several people fall with and without them up close, they 100% are a safety breakthrough and I do look twice as someone without one on XC these days (and will at least mention the air vests if I know the person). Unfortunately, the air vest are very expensive, which is a huge barrier for many eventers. It is so great that the MIPS helmets are not significantly more expensive than non-MIPS helmets.