Consumer technology products are often difficult to present well with standard photography alone. Screens, polished surfaces, edge highlights, ports, buttons, and tight tolerances all demand careful lighting and precise control. CGI makes that easier.
In practice, it solves a few recurring problems: when the device is not fully manufactured yet, when variations need to be shown quickly, when the same product has to work across stills and motion, or when a brand wants a cleaner and more controlled visual standard than repeated photography can easily provide.