Everyone knows the importance of the training before open an hotel.
It's new for all for the candidates, new hotel, new management with different objectives, differents rules and policies.
Even some persons have a rich experience, it doesn't mean that it fits the new environment. Different hotel background from different hotel groups also mean different culture. 
To be success everybody has to go on the same way to avoid confusion. The standard are not the same from one hotel group to another one.
How to serve a glass of water of how to cook a fried rice can be different from your previous job. During the pre-opening time we had to start all from the beginning.