Shooting from the joints may have been done by some cultures in period, I am not truly certain.
But I do know that though it is not a terrible thing to do every once in a while, it has very little longetudinal bennefit.
The continuous shooting in the joint of the fingers will eventually damage the joints. The pads of the fingers have the cushion required to protect the bones, the joints do not. They(the pads) can also be hardened or conditioned over time and the joints can not, they will still just deteriorate or calcify.
And lets face it guys, if you were to just shoot for a few hours, a couple of times a year, this might not show itself for a long time, but as Rangers, if we expect to shoot as much as we do, we are looking for consistancy and longevity.
The only way to get to a high level of expertese with anything, archery included, is constant repetition and that not only of the action, but of the proper action with the proper technique. Doing a hundred shots a day poorly will not increase the level of your technique, it will just cement into your muscle memory bad habits that are harder to unlearn when you get serious enough to learn to do it correctly.
It was told to me that: "Practice does NOT make perfect. Only PERFECT practice makes perfect."
Now I must say, I am not a perfectionist, but it does seem to make sense to me that spending this much time at something and wanting the best results requires a bit more effort and discapline to get you there quicker and keep you there longer.
The darkside that is your joint shooting (lol) is faster but stay the course and learn the proper techique and you will be doing it till your 90!
I am Ringulf the Dwarven Woodsman, I craft leather, wood, metal, and clay,
I throw axes, seaxes, and pointy sticks, And I fire my bow through the day.
Come be my ally, lift up your mead! We'll search out our foes and the Eagles we'll feed!