That‘s a galling oversight. Not just in road cycling, also offroad. My mom worked in an orthopedic clinic for many years, and she told me that side of head + shoulder + opposite arm is an extremely common pattern. Indeed, I did experiment that twice.
IMHO one of the biggest issues with helmets is fit. I don‘t know why, but POC helmets (I have an Octal and an Octal X with MIPS (I think, it was their mountain bike helmet). The fit is amazing for both. I literally forget sometimes to clip in the strap, because the helmet fits securely on my head as-is. Plus, they include spare padding.