I think it will be very cool to go directly from the OS to the specific game mode/mission you want.
If you combine all the time we spent this generation seeing logos, menus and loading screens, it's a lot of time. For some games this is a pain in the ass that makes you avoid certain game because it's boring to spend time there.
Moving PlayStation to Silicon Valley was one of the best moves they made. Japan is notorious for being bad for software development due to how they treat developers, their work/design philosophies and view of the field in general.
Last time I checked it PlayStation is still a Japanese multinational company and the PS5 and its softwere is designed and made by mostly the same people who made the PS4.
Regarding working conditions, USA -and particularly Silicon Valley, and not only in gaming- is one of the most crunch friendly countries in the world, not very different than Japan.
Am I the only one confused about this? What does this actually do? Does this save on download sizes? They keep talking about accessing only certain parts of a game. Makes me think download sizes can be actively controlled by the user, which would be fantastic.
Edit:
So this is about shortening loading times then? I need to see this demonstrated. Is there video of the WCR presentation?
Before running the game you'll be able to see in the OS UI open multiplayer matches ready to join specifying stuff like "it's that stage" etc. Or in a single player game you'd be able to load directly "episode 2, stage 9". You click on it and the game runs that specific part directly skipping game/company/tech logo screens and other unneeded menus and related loading screens that before you had to see.
Internally, games seems lo label which parts are needed for these things (imagine that a game has separated chunks for story mode, casual multi, ranked multi.. and in addition to this a separated chunk for each level).
So maybe, in addition to this feature, to optimize SSD space, install and downloading times, the console may only install -or to install first- the parts you'll play soon (first levels on a single player game) or automatically -or allowing you to manually- uninstall the parts you may not play again (story episodes you already completed).