The Monkees were a boy band in that managers and other people on that level got all the members together, had songs for them, told them how to dress, etc.... It wasn't a band so much as it was a musical project.
The Beatles, obviously, were not that.
But more on topic, what the OP said is true. I believe it's true because the music industry found a style of music that sold very well, and emulated it by managing and marketing performers who were willing to fit that mold in return for stardom.
Musical integrity had little to do with it. Like The Monkees.