Well, technically couldn't you make your hair grow longer by interacting with the anagen phase? What I mean is, say your arm hair is nearing the end of the anagen phase and you somehow know this. Then while you technically can't get hair past a certain length, you could aid it by pulling the previous hair out to keep I from having any resistance. It wouldn't make it substantially longer but it would break that thing about not being able to make it grow longer. Now, if you were able to interact with the genetic coding for the anagen phase and tell your body to grow it twice as long, that genetic mutation would allow you to grow longer hair on your body.
Consider This...
Well, technically couldn't you make your hair grow longer by interacting with the anagen phase? What I mean is, say your arm hair is nearing the end of the anagen phase and you somehow know this. Then while you technically can't get hair past a certain length, you could aid it by pulling the previous hair out to keep I from having any resistance. It wouldn't make it substantially longer but it would break that thing about not being able to make it grow longer. Now, if you were able to interact with the genetic coding for the anagen phase and tell your body to grow it twice as long, that genetic mutation would allow you to grow longer hair on your body.