I've been using the Halide app to take most of my daylight shots in 48mp HEIC mode (which has the benefit of being 5-15kb per photo). The main advantage to me

I've been using the Halide app to take most of my daylight shots in 48mp HEIC mode (which has the benefit of being 5-15kb per photo). The main advantage to me is that the result is much less affected by Apple's always-on edge-sharpening processing. The effective "resolution" of the processing artifacts is higher. In previous iPhones if you take a photo of a bunch of leaves on a tree it's almost like it tries to draw a little sharpened outline around each one, which looks like a watercolor mess if you zoom in at all and doesn't capture what your eye sees. With the 48mp compressed shots I find landscapes and trees look much more natural and in general you can crop and zoom into photos further before the detail is lost in the processing mess.