It shows that authoritative experts are very busy, and perhaps the busier they are, the looser the rules are, so the easier it is to have a basis for graduation thesis. In fact, many customers who have had experience in processing plants must know the raw materials and can't be trusted. "Quick blind trial" is a campus matter, not an authoritative expert. Of course, it can't be ruled out that some authoritative experts don't undertake it until the deadline of specification, but this situation is rare.