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@ReakDuck
Japanese input is doable without any system changes. Mostly adding language as well. Some software does need you to add language packs to system directories - that’s one example where an overlay fs is useful.
Mostly it’s good when you need to add specific packages (I ran into xmodmap not being available for instance). Or if you need something such as a custom keyboard layout (technically possible in your home though).
@notfromhere @greater_potater Gnome has the rotating cube desktop, burning windows and so on as extensions. Look up “rotating cube” and “burn my windows” in the extension page.