An incoming student that can't write a cogent essay or do basic math problems simply isn't ready for any traditional degree program. The best they can do, if they're not going to grind through remedial courses, is to start training for a job.
x2. The more academic requirements of a 4yr degree are not strict necessities of those fields. If college is going to stand in for vocational school then it's a waste of time/effort/money to make those students take what amounts to academic fluff.
The problem is that until colleges acknowledge their vocational role every department will be pushing for every other department to require students to take a few of their classes on the basis that it is a requirement of a well rounded education (which is not the kind of education students in the more vocational programs are seeking).