If you’d assume practically everyone (say, 95 % of people) are able to do something, and it turns out only 60 % can, then that already counts as shockingly rare. So, even though more than half of people can do something, and the ones who cannot are a minority, it can still be “shockingly rare” that people actually can do it.
In this case I’d guess it’s entirely possible that only a third or a quarter of people are able to reasonably read the body language as told here. But, @theneverfox@pawb.social can give a better estimate of this than I can, I believe.
If you’d assume practically everyone (say, 95 % of people) are able to do something, and it turns out only 60 % can, then that already counts as shockingly rare. So, even though more than half of people can do something, and the ones who cannot are a minority, it can still be “shockingly rare” that people actually can do it.
In this case I’d guess it’s entirely possible that only a third or a quarter of people are able to reasonably read the body language as told here. But, @theneverfox@pawb.social can give a better estimate of this than I can, I believe.