It is always handy to have some advance information, but these things often come at a cost:
1. Money, who will pay for training and how are people classed as current.
2. Empire building. Before you know it, some empire builder will have the rules changed to say that you cannot land unless the site has been cleared by a 'specialist'. (seriously! ask the military people on this thread)
3. The pilot will do his own recce anyway, regardless of the information passed.
4. Non trained personnel would soon start copying the 'expert' and could possibly choose a dangerous site. How could crew know who is on the ground?
My experience has been to treat every site as a new one and do a FULL recce every time.