[dathinab]

It's not useless, just bad at it's job.

I mean in practice it's so broken, imprecise and messy to a point it's often more misleading then helpful and IMHO should have been replaced in teaching with something better well over a decade ago.

And to be clear I'm not saying it's bad because some small implementation details don't fit, it's bad in it's job of being a high level abstraction where you ignore many implementation details.