The way people takes photos changed (using phones instead of cameras changes the frequency and type of pictures) so iPhoto had to change to accommodate the new

The way people takes photos changed (using phones instead of cameras changes the frequency and type of pictures) so iPhoto had to change to accommodate the new users and usage pattern, or go stale and cater an ever decreasing user base. You’re damned if you do and you damned if you don’t. If you find a great UX for your app and decide to keep it that way, 5 years later all potential new users will look and say “that’s old, isnt there a modern app for this?” It’s silly, just like fashion, but software has a user base way beyond tech enthusiasts and that user base is very sensitive to cues similar to the fashion industry.