"Also some of the science and tech courses are very demanding but the teachers don't simplify it leading to many whooshing sounds for the student throughout the courses. Such courses could benefit from a simplified overview of the course material."
How many employers would like to hire people that can't understand the actual content and need "simplified overview" to get a grade? If you really don't grasp it to the point where you can actually apply the math for new, novel problems, then you don't actually know it, do you?
MOOCs have a serious credibility problem already. The very last thing they need is to dumb things down. If it becomes common knowledge that, say, an engineering MOOC graduate can't even handle a system of differential equations in an intelligent manner, or don't understand the implication of Green's function, then the credits will become truly worthless.