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Because we need peer reviewed papers on our CVs!

I also detest simple things made complex, though. In my experience (with has covered electronics, epidemiology and geography) reviewers tend to pick up on obtuse issues in text but miss glaring errors in the math. It's sad, and you can see why someone less than scrupulous would exploit that tendency by over complicating things. That said I think plenty of authors are honest but just not very clear thinkers!