That said, I really dislike how "bureaucratic" German spelling rules are, including this recent addition. Instead of blanket allowing the use of an apostrophe for the genitive (at least for personal names), the new rule allows it only in very specific circumstances. I'm of the opinion that nobody should have to consult a complicated rulebook in order to write well (in fact, the best way is to just simply read a lot and then mimic what you read).
Then again, most people don't need to care about what is or isn't considered proper spelling. In theory it should matter for official documents etc., but that doesn't mean that those never contain errors (quite the contrary, in my experience).