Actually, after thinking on it for a while, I think there's a far better reason. The camera sensors used in the iPhone are standard size (3x2?). So if Apple were to default to a 16x9 or whatever sized photo, you're tossing out a portion of the image before you ever get to see it. It would be like going to a restaurant and having the waiter toss out 20% of your food before it's delivered to the table. The way they do it, you get to see the full image captured by the sensor. Then it's up to the end user to remove any portion of the image they don't want with cropping.
Could they provide other aspect ratios like they already do with square? Of course. But this is Apple and since when have their products been overflowing with options? My guess is if you don't like the default aspect ratio, either find a camera app that will give you what you want or crop (perhaps even with an automated tool). Apple could change things. But my money says they don't.
Could they provide other aspect ratios like they already do with square? Of course. But this is Apple and since when have their products been overflowing with options? My guess is if you don't like the default aspect ratio, either find a camera app that will give you what you want or crop (perhaps even with an automated tool). Apple could change things. But my money says they don't.