I agree with everything you said, but especially this: "The band doesn't fail people; People fail the band."
Unless you had an incompetent surgeon who placed the band incorrectly, or you're one of the extraordinarily rare people who had a mechanically defective band, the band works. Or maybe I should say the BAND PROGRAM works, because nothing is a magic cure for obesity, not even the band (or sleeve, or bypass, for that matter). The band is simply a key component in a system that involves eating less, eating more wisely, eating healthier, and moving your body more often. You can't just pick and choose which of those pieces of the system you're going to actually do. You have to do them all.
If you don't, you won't lose weight. But the band didn't fail; the bandster did.