If yes, what were your experiences: positive or negative?

Why?
There are millions of people searching for their jobs. Employers use different tactics to select between applicants. What I found lately is a tactic where prosperous new employee should prepare presentation (e.g. to board members) with one of employee from hiring organization. It is presented on an interview discussion that new hire could get the position only if presentation would be a fit for the board. The only connection between a position in a new company and a candidate is this employee fellow. So the employee is all sweet and kind and asking tons of questions and diligence in writing what a candidate says. Company employee squeezes applicant from different angles and asks to prepare special scenarios and data. It is an additional knowledge, experiences and possible different thinking that is asked from candidate.