@gordon1234
Taking lower resolution photos aren't all about storage space, there are many reasons why people choose not to use the full resolution of the camera. It is sometimes simply the best thing for that particular shot.
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I have never heard of a professional photographer deliberately shooting at a low resolution (as an aside, my father is a professional photographer). Higher-resolution photos preserve more detail, you can make larger prints if desired, view them on high-DPI displays without pixelation, zoom or crop them while still maintaining good quality. I would be very curious to see what situations you feel are better photographed with the front-facing camera.
I don't have any problem with someone using something in a unconventional way if it works for them, but it does bother me when someone does this, then complains bitterly because the thing being used a way it isn't designed to be used has problems when being used that way.
Apple made the perfectly reasonable assumption that the lower-quality camera that points directly at the phone's user would only be useful for taking photos of the user, especially since you can't even see what is being photographed if you use it any other way.
If space is an issue, use iCloud - it has not developed the reputation for killing people's library. Don't want to use iCloud? Dropbox, which you already use, has an automatic upload feature that works quite well and can automatically remove local content to free up space.
If you're thoroughly intent on taking low-resolution photos some of the time, there are lots of camera apps (Camera+ being one I've used) that will give you this option.
Any combination of the above things I've mentioned would be preferable to using the front-facing camera.
