It's overblown. Most teams have variations and change it up by qtr. Now that they are moving to headsets it's not a big deal.I'm probably in the minority here, but I don't see the big deal in sign stealing. I wouldn't want somebody stealing my signs, so I would be working on protecting them from prying eyes.
I've watched and heard the 'MI Sign Stealer.' It seemed to be more based on tendencies and game flow. Protect your signs.
I'd be trying to steal signs. I'd be protecting my signs.
I believe everybody did it. For a while, MI did it better