Marc, in regards to brisket, my experience has shown that the flat turns out juicier and with better taste if you do not remove the point. This probably true only in the first couple of slices close to the junction of the point and flat. With butts there are I believe 7 different muscles in a butt, each with different qualities, ie money muscle, tubes, muscle on both sides of bone, and the muscle in the middle between the bone and MM. My recommendation is to keep the butt in tact if you can. As others have pointed out you can reduce cook time in other ways.
Mark