On the Windows desktop, laptop and Synology NAS, my photos are just stored/named by date (too lazy to go through and categorize/sort them).
Personally, finding photos via geotags, facial recognition and machine learning on the iPad is easier for me than trying to find it on my desktop. In a pinch, this is also doable on the iPhone. I just prefer the iPad’s bigger display.
Plus, in case there’s a house fire or something (heaven forbid), I’m more likely to have my iPhone and iPad with me than the desktop/laptop. As long as the iPhone still works, I can always copy photos from the iPhone to a new PC. Then there’s also iCloud for offsite backup.