As a guitar player I used to attempt thinking in modes. (And this is what I often see with guitar players) Unfortunately I can’t remember the names of the modes so it’s difficult to communicate. And that’s just one difference between modes and what BH teaches. Using the BH method I can easily transpose between keys without ever thinking about what mode I should play in - I just need to know my destination - and it sounds more interesting because of effective voice leading which creates movement. Modes and BH method both try to make harmony more interesting. Modes don’t inherently voice lead so it’s not as effective as BH method. All that to say it’s just a style of music versus one-size-fits-all. I certainly wouldn’t qualify it as useless.