I have, like @ggbutcher many reasons to photograph, and a history of collecting images that are of a variety of qualities and purposes.
However like Pete Wands (mentioned in the original post):
I find that there is a benefit to consciously doing “hobby” photography. That doesn’t mean I won’t sometimes use my camera/s (as opposed to just a cell phone) to take photographs as part of my work, but the main reason I took up photography again (as opposed to taking an obligatory family shot, or recording the breaker box, or how to put away the Christmas decorations) was for the pleasure and creativity of the activity.
That creativity does involve processing as well, but the hobby is also an impetus to go somewhere new, or consciously seek to capture something different in a familiar locale: maybe using different framing or settings, or just trying to photograph a different species (I shoot a lot of wildlife).
Yesterday on a work outing I deliberately put my camera and long glass in the car, and I noticed a small park with lake with plumed whistling ducks. I have only managed a handful of captures of these previously, and all quite some years ago, in less than ideal conditions. On making my return journey, I stopped for 10-15 minutes to capture some images. It was a helpful tonic in disengaging from my work.
I share some of my results with friends and family … on my piwigo gallery, or via a canvas print or mug or similar as gifts on occasion. I have some prints of my work on the walls of my home, and as rotating wallpaper on my home-media PC.
Another answer to the Why? question: the capturing of images is frequently only a part of the activity that has those images as only one of its outcomes - getting in a wonderful hike, or exploring someplace new, or enjoying observing a new species, and can help not just be a record of the activity and an aide memoire; getting out is good for the soul.