My sentiments are similar, but rather than focusing on different cultures, which are by nature more fluid, I'd rather the creators of different races (anthropomorphic or not) spend time developing the nature of a creature. It's a small distinction, but an important one. Culture covers things like language, history, customs, social structure, and mythology. While that's interesting and can give a lot of insight into the nature of various creatures, it can sometimes conceal the essential qualities of a creature too. If you develop a creature's nature, you figure out the most significant aspects of the creature and determine how that affects its psychology and culture.