Ross Millard wrote in with a complaint about Photos for macOS. He notes that he can’t easily find in which folders his images live on his computer when using Photos. He’s used to interacting directly with his media via Aperture, and having it directly accessible. iPhoto also made this easy.
Photos, like iTunes and iMovie, doesn’t have a great way for you to access the media and other items that it manages, but there are some workarounds.
Apple gradually changed its app design to rely on library “files,” which are a special kind of folder, called a package. To the Finder, and for the purposes of copying and moving items, the library is a single folder. Inside, it contains all the sausage-making ingredients used by the apps, including original media files, modified ones (in the cases of Photos), project components, and one or more databases that track what’s inside the library.