This is absolutely the way forward, and it applies equally to novels where you chuck the reader in at the deep end (a technique i almost always use, as the reader then has to invest time and emotion into the book) or where you let the reader have an easy time.
Me, I prefer not going for the deep end, partially as I put down a few too many books these days because I'm being asked to invest emotion before I'm ready to, but I think that's a matter of author skill than an inherent flaw.
I agree with The Big Peat in this case. I'm getting insulted by TV shows that literally start with an explosion then you see "Three hours/days earlier..." I'm not a gnat; I don't need to know the middle or end first because I'm gonna die in 24 hours. I don't have the attention span of a three-year old, so treat me like an adult. I think this instant-gratification thing is getting to be too strongly emphasized in fiction writing. Yes it is absolutely doable and yes it can be spot on the right thing to do, but Brian's writing an epic fantasy...emphasis here on epic for my point. The doorstopper fantasies have a following that is used to giving the author room to develop the plot, the world, and the characters. Tad Williams's Memory Thorn and Sorrow series was a huge success. It took 13 chapters before our hero lad left the castle. Many chapters of his scurrying about and avoiding work. And he'd coming out with another novel in this line so even though the original four are old, it's still going. (Cute side note: I learned about because he was on one of my panels at Silicon Valley Comic Con. When he announced it, I swear to god, a girl in the front row literally, yes literally, squealed, threw her hands to her mouth, and wiggle-hopped in her seat). Lord of the Rings took me three months to read the first 100 pages, just poking at it, then three days to read the rest. Granted, you don't want THAT level of intro, but the point is, your epic fantasy audience can be patient. In fact, I prefer some level of it. A NY Times best selling author has told me that the second chapter is for world building.
So what's the first chapter for? IMHO, it's for character building. I think we are evolutionarily engineered to respond to other people, so hooking us with solid characters is a great first move. I think this should be done, not by chucking them in the deep end per say, but by showing us a little of what is ordinary for that person's character. For example, I just read Court of Thorn and Roses and it starts with a gal hunting for food for her dependent family. She does this all the time. It's showing the ordinary. Then you throw in a little twist, something out of the ordinary, in this case a really giant wolf came by, a wolf, is not unexpected in the forest setting, but tension is amped up by just how unusually large it is (and other minor details). She shot it. A few chapters later we learn this wolf was fae and her world turns upside down. After she shoots the wolf, she skins it, goes home, we meet the family, and we spend a little time establishing her world as it exists at that point.
I think a plot driven story with bad characters is harder to pull off than a character driven story with weak plot. Engaging characters can go a long way to pull the reader along. And it doesn't have to be really horrible twisty stuff to engage. In fact only a little off normal can work quite well. When I was reading Twilight, I though to myself, "This is the worst first 100 pages writing-wise that I've ever read," and then I read the whole series. As maudlin as that story was, it was character driven and it carried the weight of the whole story against many negatives. You don't have to like the overly moody types in your reading, but for those who do (of which I am one), Twilight did a very good job representing that type of character. And it starts with her world changing (a change for the character) but in a very normal way, a move (which is like a wolf in a forest, atypical, but not outside the expectations).
As with everything, you have to figure out audience. No book appeals to all, so no one bit of advice can serve all fully. In the case of Brian's work, if it's epic fantasy, then he has to appeal to and engage epic fantasy readers. This is a different task than appealing to whatever crowd it is that likes those TV shows that start with "Three days earlier."