If you actually bother to define cartooning and anime, they are both just drawing simplified representations of forms.
I don't see how a system of representing forms can preclude any content/message that the artist might want it to carry.
Here's an anecdote that describes what I think these arguments are actually about:
When I was in art school, the students who were anime/cartooning focused always had a lot of trouble, particularly in life/figure drawing classes. They had deified their system to such a degree, that they thought that learning to do realistic, unsimplified representation was inferior and a waste of time.
They didn't and don't ever improve; their characters stayed poorly rendered even by the same standards they subscribed to. The reason is that you have to learn a form before you can learn to simplify it. I don't know of any truly successful cartoonist/anime artists who can't draw a convincing human figure, or cannot draw from life.
But as a rule, they took critique poorly, and were generally content with sitting around feeling like their style of art was being persecuted. What they didn't realize was that the serious cartoon/anime students had already realized that the bickering was a waste of time, and were now busy improving their craft through practice and study.
I guess the moral of the story is that you're just going to stagnate when you have an attitude of exclusion and self-righteousness.