There is a gallery. It's called Rewatchable Scenes and it's in the game menu. Anyone can share those files, just like saves.
All game CGs are also on the thread main post.
Everything is moddable as well, on top of that, there's a console that can be used to jump to scenes. One can simply look at the story files and jump to key points using the console.
Extracting game data is done in the game settings menu (
modding info here).
Here's an example of how to use the console for jumping scenes.
Save file location and Rewatchable Scenes locations are in the game FAQ. The folder can also be opened from the settings with the "Open saves & mods folder". Save and Rewatchable files can be extracted there.
Are they not? Hmmm, I love going into my game's thread and learning new stuff about my system!
I would strongly advise checking before making such strong claims.