Photography is much like any craft. Just like writing, you need to know proper spelling and grammar. Once a writer has the basic down, he or she may break the rules and use bad grammar or misspellings intentionally. However, if a writer just has bad grammer and bad spelling, he's not serving the craft and it's just bad and ineffective writing. Why I'm trying to get at is the craft should serve the art. Blur and grain with photos should serve the art otherwise it's just bad technique that's is masturbatory and self-indulgent.