I don't know about years past, but if it's true that our QB's used to always wear the play calling wristbands and now they don't, that is an interesting observation.
LaFell was quoted as saying our offensive playbook is 3x thicker this year than it was last year and I've also heard that we're switching from a play call naming system to a numbering system, so you would think they would need the wristbands more this year then they did last year, but it may just come down to a matter of personal choice this year when last year it was mandated?
If we're going to a numbering system, that would explain it. Don't need it, except for 2-minute offense type situations where you want to be quick with getting the play in. Also, it could just be part of the learning process the coaching staff is implementing. As others said, "learn the playbook or sit" type of thing.
I don't think we have ALL the playbook in yet. Hell, I don't think we have half of it. But, we have the basics in and they'll add a little each week, as long as they execute each and every game with what they already have in.