Yes I see the same. Why? The sheer size of the manuals is a factor I imagine, using a reference book (that's what it is) is a dying skill it seems, Google is your friend these days.
The manuals while technically correct can also be confusing as they often quote the required information for all versions of the same model in the same pages, but many makes do that.
Time is a factor for some people, but you could also call that being lazy.
This forum has many people with a great amount of knowledge.
From a personal point of view I would try to seek the information first myself, and if stuck come on here.