You think that's why every sentence (outside of figure captions and intro) has a bold part? It's sprinkled throughout so much that it hinders regular reading (or maybe that's just me? I find it really hard to read any paragraph at normal speed and not get distracted and skip to a bold part only to be missing context) and anyone looking to read the important bit is not aided in any way

I've also seen this on human texts, but only quite long ago