HR professionals need to know it also. They also inadvertently also slow the new hires development and the time it takes for them to reach their expected productivity. Almost all companies do an orientation for new hires but few pay much attention to them. Often workers come to work excited about the prospect of a new job and new friends only to get cold water in their face the first day on the job. A simple survey of workers not only will show how boring orientation can be but also how little of it employees actually remember.
HR has it all backwards.
You spent the morning filling out confusing benefits forms until it hurt. Your boss might have been out of town the week you started. You met dozens of people but you don't remember any of them. Many new hires are questioning their decision by the first day. The next week isn't much better with nothing to do because the boss hasn't had time to give you a project.