Onboarding is a hot topic in HR circles, and rightly so.  Clearly it's important to bring new employees into the organisation in a way that sets them up for success in their job and has them excited about the company that they work for.

There's many articles about how to get it right or how to not mess it up, much of which contains good advice.  

But ... the most obvious critical thing to get right in onboarding seems to be missing from this advice ...