I'm frequently bothered by the shockingly anti-competitive nature of software today. Walled gardens and lock-in are pretty terrifying. If you want to continue to control your data, you can't trade control of it away to a software company for convenience and a shiny user interface.
My collection of music managed by beets[1] (and properly id3 tagged) will never be inaccessible to me because all of the data formats are open and standard. If I were using iTunes, perhaps that would someday be untrue.
I'm not a big photos person - do any awesome FOSS photo management programs exist?
[1] https://beets.readthedocs.org/en/latest/guides/main.html