Re: Why the extended fingers in Aikido postures
the extended fingers seems to be universal in many arts. chinese arts call it something like 'tile pam/hand'; you can see it in taiji, as well as bagua palm positions. ive seen daito ryu practitioners emphasize the extended fingers in some of their exercises as well.
it seems to strengthen (connect) the fingers/hand to the rest of the arm to make it one piece, so the power coming from the elbow or hara or foot can more easily transfer to the tips of the fingers.
just an observation from a beginner. please feel free to correct where i am wrong.