To get back on topic: this is an issue of posture, and what I would do in this situation is exercises for the back and neck to strengthen them, and I'd try to work on keeping proper posture at all times while sitting.
That's ridiculous. Making a pianist maintain a specific posture is just as bad as making a pianist hold his wrist in a specific way.
You do whatever it takes to produce the best playing. If you need to bend over the piano in a shitty posture, so be it.
There is nothing wrong with it. And if anything you should focus on your playing and not your posture.
By the way a 2x4 is a wooden piece of wood that it appx 1.5 inches by 3 inches.