For me: A local model to plug in to Apple photos to look for metadata inconsistencies in my photo librar, add missing location information, add dates from those old scanned photos with the date on the corner.
This seems like a relatively easy thing to code oneself, or for someone to have already made somewhere (relatively easy, just writing something for yourself command line doing it, assuming you can spend a work week of nights [worst case, based on my working with images in folders in the past I think 10 hours for something that works, reasonable time for coffee and other breaks])
Yeah, there are probably a few multimillion dollar app ideas in here, but of insufficient complexity or lowbrow-ness for the typical HN reader (myself included). The nano-banana template idea or the Q&A Walkman, for example.
