Many companies have made the determination that they no longer have the time nor the budget to teach - anything.
They’re kidding themselves. They still have to train the H1Bs, they don’t come in knowing the company specific operations and policies. Requirements and technology changes and the requirements to be successful in whatever endeavor is dynamic, rarely static. Training and retraining are essential for long-term success.
Many companies favor their employees to work extra hours than hire entry level personnel.