Nobody is telling you to stop spiraling your arms. You are free to do whatever you want.
In fact, please keep doing it, video yourself, post it on the site to show everyone how successful it is and put us all in our place. I am being perfectly frank when I write this.
In the meantime, science and a wealth of experience has shown us that it is not a valid technique. Thus, the majority of us will choose not to implement spiraling.
Regardless of how well Tyson Gay performs from here on in will be irrespective of the arm spiraling technique. It will have about as much impact as Lyoto Machida claiming he drank his own urine every morning.
And, for those of you who claim, “Tyson Gay must know what he’s doing. Why else would he try this technique?” If you have ever worked with elite sprinters, you will quickly find out that they have little to no clue why they are doing what they are doing. They may be nice, interesting people who run fast – but that is typically where it ends.