I don't think you quite get the point I was making with the analogy. But regardless, there is an issue that non-degreed people will be even more looked down upon than they already are - and that is already a significant amount.
I do get your point, I just don't particularly agree with it. I think that when you argue one side of this, you also illustrate the other side. For example, you argue that there are people who can do the job but would not be able to use the title, and that having the title does not mean one can do the job. Ok, fine... but that also means that not being able to use the title doesn't mean one can't do the job.
And what of the people who are doing equivalent level work? It's too easy to say that "refuse engineer" or "sewage engineer" are misusing the term - that's not the point I'm interested in. What about the people that don't have degrees but have the ability?
Well, those people are doing work equivalent to engineers, but aren't engineers. My sister is a midwife. She does work equivalent to doctors sometimes - giving injections, delivering babies, prescribing medications. But that doesn't make her a doctor.
I know a guy who owns a machine shop and does a lot of engineerING, but he's not an engineer. He calls himself one, but while he has a good depth of knowledge in one area, he lacks breadth. When I was in university (for mechanical engineering), we had to take a whole lot of courses like statics and dynamics and materials courses. The guy I know who calls himself an engineer knows a lot about machining and manufacturing, but doesn't know what Young's modulus is or how to calculate the loads at various points on a bridge span. So he's not an engineer because he doesn't have the education to be one, despite knowing a lot (even more than most engineers) about his specific area of expertise.
I think that if someone has all of the skills and knowledge of a real engineer, then getting the degree would be trivial. If one feels the degree is not important to the work, that's fine - and then not using the title would really have no effect.