My 2 cents, from experience and observation...but just opinion.
The use of files in the Loveless book is good, but all the photos in that book kinda suck (too dark, not crisp). When I started I began with files. This means you have to take the blade closer to finished size before heat treating. Lots of things take longer. I found that having the blade at the right height so I could jam the handle of a 12" Bastard cut file in my hip and drive with my legs was a good technique, but most people when handed a file go at it all with their arms. It was discouraging seeing all these great looking knives in books, but then the method of making all used tools that were out of reach at the beginning.
Design is generally not talked about enough. There are a heck of a lot of knives out there by otherwise skilled makers that are lumpy looking, or lumpy handling, or both, so just looking at a lot of knives isn't enough by itself to teach you design. If you don't have an eye for lines and flow, you won't pick it up by osmosis if no one tells you what to look for. If you don't use and handle a lot of knives with a particular mission and some experience of use, you won't see those details. This is part of why so many beginners who post examples of knife designs here for critique have similar issues to address. The problem with writing a good design section is needing experience with the knife types being described. Lots of examples of people who are expert in one or two styles doing an awful job advising on another style, not realising that the good features they always use may not be so good when transferred.
Drawn graphics have some advantages over photos and videos. There is a great bit in the video Flat Grinding by Harvey Dean where he talks about pressure on the blade and changing the angle of blade to belt. Its not so easy to see, and hard to photograph, but I bet a lot of that stuff could be illustrated well, with exaggeration to make it clearer. When someone exaggerates in an illustration, its easy to tell that is what it is, but when its a photo it can look like the exaggeration is how it is meant to be done.
More stuff about drills and making holes. Given the number of questions on the forum, and the problems one can run into using the wrong drill bit, at the wrong speed, in material that is too hard, too soft, two abrasive, etc. There was a pretty big thread once,
Art and science of the perfect hole. The whole topic of fits, choosing drill size vs fastener size vs material, doesn't get much time, but finding that holes have shrunk happens to the best of us. The tips and tricks of drilling a pin hole in a hidden tang so that the handle hole is kept tidy and located...lots of stuff that gets shared here, but not always described in books.
Good luck!!
Chris