RE: Got my longbow
One of the big benefits, to me anyway, of an exagerrated follow-through is you can get an idea of what you are doing--right or wrong. If your bow arm drops and you are consistentlyhitting low and left (right handed shooter), you know you are dropping it too soon. If your release hand is 6" in front of your face, or well away from your face, you knowyou aren't anchoring properly.
Just my opinion (take it for what it's worth), but I have no idea how Fred Asbell became accepted as an "expert". I tried to read the books (just couldn't get through either one), and I have the video. Like Art said, there is some good info., but some that's just so far out there it's funny, and he contradicts himself. For instance, in one part of the video he says you should anchor a certain way to get the arrow close to your eye, but in another part says you shouldn't shoot 3-under because it gets the arrow too close to your eye. He says something like "you cannot shoot accurately using 3-under"--guess he's never seen Rod Jenkins or Ricky Welch shoot. He uses a super-light drawing bow to exaggerate why you shouldn't shoot 3-under (I don't shoot 3-under, but I know a lot of guys that do, and are excellent shots).He puts lots of extra pressure on the lower limb, making it bend much more, which is very misleading.
Nothing personal against the guy--don't know him and never met him--I just don't agree with a lot of what he says.
Art covers the rest very well.
Chad