Very much so. Author here. I wanted to do so much more than the box they allocated me in. Once I knew they were not going to let me grow from my box, then I left. Not the level I was worried about, but it's a language most people can understand

Any chance the problem with your promotion was someone above you taking credit for your work?

The Box is very frustrating, especially when there's no one handling the other things, yet you're still not allowed to do them because it'd make the wrong people look bad.