>The more you know about something, the less creative you are
I don't buy this one at all, sorry. As an academic, I do recognize that I spent most of my professional career in expository rather than in creative writing. So I would buy the argument that pretty much any graduate-level work is going to emphasize the former rather than the latter.
But I don't believe creativity is some delicate flower easily crushed by the blundering beast of formal learning. Creativity is as tough as a badger. It does not die. I side with Hemingway and others who essentially said, if you can quit writing, you aren't a writer.
Nor do I believe learning the mechanics of a craft lessens one's ability to innovate in that craft. The facts simply don't bear it out. True, any number of people in a field go into it thinking they are going to be creative and revolutionize their world, only to find out they are merely mortal, after all. But I still say that's on them. One can blame the education, but doing so misses the mark.
That said, I do think it is a mistake to go into some graduate program thinking that it's somehow going to make you more creative. It isn't. You will learn technique. That's it. You can learn technique outside of school as well. Most of the time, it's a less efficient and reliable a path, but many have trodden it with success.
I agree with Skip. I don't believe it to be a double-edged sword for a minute.
We can look at other charts (like the Dunning-Kruger effect) that says the less a person knows about something the more confident they are.... the more you learn the less confident you get until you become a master and that confidence comes back.
I've seen it a hundred times where someone with very little skill in story writing thinks they are the most creative person in the universe... until they actually start to learn about what it takes to write a real story. Then they realize pretty quick that it takes a lot more than creativity.
Creativity alone does not make a person a writer, or an artist, or a computer programmer. You have to develop the skills and the techniques along with the creativity. Educating yourself will only help that, not deter it. Whether you do that youself, or in a classroom, is up to you but at some point it needs to be done.