This guy breaks down just how bad the layout of the new PHB is. The cross referencing is non-existent and the subsections seem to go in the order someone thought of them. I'm sadly unsurprised that they've not improved on any of these problems which existed in the original 5e PHB.
The fact that a basic system like stealth and vision is so spread out is probably a big part of the reason why everyone complains that combat is just a slugfest. Why would you use a skill like stealth in combat when that requires checking like 5 different pages when an attack is a simple d20 and damage dice?