i think it's more for the look of the cue. I had a cue made recently that has an elphoryn joint. i went with the half joint purely for looks. The cue I had made was Amboyna with Ebony points and i didn't want the joint to overtake the look of the cue. With the half joint the cues look seems more balanced to me. It seems sometimes when I see cues with Ivory or Ivory substitute full joints it looks like the joint is a mile long.