Two notes..
To this day, TPA has lanes/signs/etc but chooses to ignore their existence and just puts pax where they want at any given time. You arrive at the checkpoint and whatever lane they want the current unloading group from the tram to use is open, the others are closed with the little adjustable stantions.
Over at SNA, I wandered into the black diamond or whatever lane, but as I walked around the outside of the mas of travelers and saw no one ahead of me, I thought I got lost and was going the wrong way - the TSA on duty at ID-check insisted I continue through the stantion maze all alone, "No changing lanes!"
Turns out I was the only person, and walked right ahead of about 100 people who were waiting.
This system really is terribly flawed.