Oh my, this is good stuff. I haven't had such a good laugh at work in a long time.
Uncleal, I've simulated your written description while standing in my office, including step 4-and-a-half. I can see, technically, how this might be possible to achieve under certain circumstances. It would take a phenomenal athlete to turn two given the speeds and distances in MLB, but I'll grant that theoretically it's possible. First, let's make sure I understand your motion correctly:
Sounds like you are making a throw 'similar' to what we often see when a righty 2bman tosses over to a shortstop covering the bag to end an inning. Both feet stay in the same location; the throwing-side foot pivots on the ball of the foot; the upper body twists as the arm ***** back; and the throw is released as a side-arm toss (almost like hitting a hard forehand volley in tennis). With a lot of practice and hard work, a talented y with exceptional arm strength could get this move to work while turning two, probably throwing the ball 85 feet on a 'perfect' throw.
If that's an accurate description of the move, then let's move forward to analyzing why we don't see it in MLB.
1) The real-life limitations are, well, real. They are also well enumerated by others in this thread. The primary limitations are
a) injury risk because you aren't getting your body out of the way of a sliding runner and you're putting a lot of torque on your body and upper arm, and
b) it's more effective to utilize the natural motions of a righty throwing across his body while gliding towards the pitcher's mound. Think about scrambling QBs in football - there is a natural side that they move to that allows them to throw the ball - same with infielders. To turn two, a 2B has to move to the right and throw to the , and this is easier for a righty. And takes less time because he has more on his throw.
2) Though I will admit that it's theoretically possible, I find that any y who is capable of learning this move will actually be limiting his effectiveness on the field. A coach will get better return on his athleticism if he were to play him in the outfield or at pitcher. Why put all that effort to get this guy to learn a move that has a greater risk of injury when he could put him in center field or in right field where his natural motion and arm strength will be better suited to nailing a runner going for third (think Ichiro). Then stick a righty at 2B who may not be as gifted but can play the position just as well.
So, I suspect that the exceptional y athletes who are physically capable of making the play you describe have found themselves in the outfield, or pitching. If they're tall, they've dedicated themselves to hitting and play 1B.
And though you may find this hard to believe, it's a waste of talent to put that guy at 2B. And if you decide you need to go through with posting a video, stick a timer on it. Then switch with a righty 2B and you'll prove to yourself why it isn't done in MLB.
Then you'll get a good laugh along with the rest of us...