Sure, MG, but it all depends on the approach of the publishers.
You see, I've come across history books that purported to show the ultimate "100-year history of ... (put in whatever subject comes to mind)", and where, on the face of it, this history ought to give exactly even coverage to each of these 100 years (or at least to each of the 10 decades of that century) but on looking closer you find that the "first" 70 or 80 years are glossed over on the first 30 percent of the book and then the most recent 20 or 30 years take up the other 70 percent of the book, including a large part devoted to whatever the most recent events or stars or celebs are, i.e. those that make headlines TODAY and are what such a books sells for to the superficially interested.
Not what somebody interested in the ACTUAL history would want to go for.
Ah!
Glad to see I haven't come across such books.
BTW, even coverage doesn't do it. Importance has to be taken into account. But not to focus on one bit to render the other bits unnoticeable, of course.
MG