Well I'll take a stab at why CS should not be vocational. The field is first and foremost a branch of applied mathematics. The tooling taught in a CS program only has utility insofar as it serves to teach the fundamental mathematical concepts. This is especially true for undergrad.

In my opinion, there are far too many people enrolled in CS programs who would be much better served by a software engineering degree or program. However, modifying the way CS is taught us not the answer. A separate niche needs to be carved out.