According to Wikipedia, Obfuscation is the hiding of intended meaning in communication or message, making communication confusing, willfully ambiguous, and harder to interpret.
“Eschew obfuscation”, also stated as eschew obfuscation or espouse elucidation, is a humorous fumble rule used by English teachers and professors when lecturing about proper writing techniques. Literally, the phrase means to avoid being unclear or to support being clear, but the use of relatively uncommon words causes confusion. That makes the phrase an example of irony, and more precisely a hetero-logical or hypocritical phrase.
Similarly, Heresy is any belief or theory that is strongly at variance with established beliefs or customs. It is also an opinion, profoundly at odds with what is generally accepted. I am sure that you are aware of the facts where people have risked their lives by such questioning. A few names like Galileo, Copernicus, Martin Luther King stand clear when we talk about heresy.