I agree with your post but I am going to nitpick on one detail, that is regarding this "Not saying that simple = wrong, but to ASSUME the universe is so simple given so much evidence to the contrary". I see your point but I also give an example - before people knew the earth orbited around the Sun and that it did so in an eliptical path they tried to explain movements of sky objects with circles.
When those circles didn't work they used more circles and things got more and more complicated. But two new (I think basic) notions entered, Heliocentrism and the ellipse and things became simpler. I now look at the way quantum mechanics is defined and I think there has to a concept other than the particle that simplifies the QM model. I think that in the end the Universe is simple, not in the sense that a 4year old can grasp all of it but that there isn't a never ending complexity to it.