

By “core apps”, you mean literally only two applications.
The terminal is replaced with one that has a container workflow because that is the recommended and expected workflow for anyone working in a terminal.
The store is replaced with Bazaar because it is the only one that is even trying to provide a good flathub experience.
That’s it. Everything else is stock KDE.
Bazzite, there’s a nvidia open and closed edition, both with the drivers preinstalled and ready to use.