Most iPhone users would be storing photos in iCloud. And most professionals are storing their photos in Creative Cloud. And in both cases the photo data would

Most iPhone users would be storing photos in iCloud. And most professionals are storing their photos in Creative Cloud. And in both cases the photo data would be replicated on multiple hard drives for redundancy. So it would definitely be more environmentally friendly to have smaller photos. The more important reason is that cloud storage costs significantly more than local.