Have to say I don't agree. The model is the college process generally.
To be admitted to a college as a student, you apply and are accepted, you pay tuition, and attend classes. They don't give you more tests after you get there, and turn some people away. If you do the work, you will get a degree.
That's the model I think people assume for college baseball. You get recruited, are accepted with some kind of offer, work hard, and have a roster spot.
The assumption is that if you have been offered a spot on the team, the coach has already kicked the tires, just like the admissions office has. Obviously the coach will be evaluating you for playing time, but why would anyone assume that the coach is going to be doing more evaluation with an eye to rejecting you? Unless he has told you that is what he does.