He technically didn’t. It was originally owned by George Lucas! But it was mostly just the cgi arm of his special effects. Jobs bought it off Lucas and turned it into the Pixar movie studio we think of today. (Jobs is credited as executive producer on the original Toy Story)
Photos will automatically categorize pictures by person, place, thing, etc… I never bother making folders or albums because I can just search by date or place or “black cat” or whatever. If the system can’t figure it out on its own you can easily multi-select a bunch of pictures and add keywords, which can then be searched. If you really don’t want to see the whole unfiltered camera roll ever you can just stay away from the library entry. If you are in “My Albums”, for instance, and quit the app, when you come back you’ll still be there.
I guess I don’t really understand what you’re looking for.