>>Is it that complicated to saw...tiger right 4-3 man? Or whatever?
It shouldn't be that complicated a call, even in pro. You should have a front call, which includes alignment, a coverage call which should be no more than two words, and any special instructions like blitzing, stunting, etc. So a total of four words or less, and often the FS calls the coverage in huddle anyway.
But I don't dislike the call to use wristbands, it's something different, and certainly keeps any confusion from happening. Plus, in an emergency situation, you can always have your LB call his own plays - they're right there.
I'm non-committal on it. I will give them the benefit of the doubt, anyway.
Assumedly, they change those bands every week, just as they would the offensive play sheets the OC or HC carry around during the game, and they're well-protected anyway. But playbooks are way more accessible than you'd think, being as how I have a couple of them myself.