... iPhone users that take pictures are doing so to upload them to social media websites or email/text them to friends. They probably couldn't care less about "quality"...
And there, in one sentence, is a PERFECT description of the millennial generation.
If you don't see the difference in the quality of these images, or if you see it but it doesn't bother you, welcome to the millennial generation.
Hard drive and device memory cost is cheap today. There's no need to sacrifice quality just to save a few bytes of memory!