Foldable dual screen phones seem like a solution in search of a problem. Samsung patents reveal what the company engineers believe might be the right problems to solve for a successful foldable phone. As we saw before, providing gaming controls on the second screen while gameplay runs on the other screen is the most obvious solution - it's the Nintendo 3DS, but reborn as an Android phone. The patents also talk about using a stylus - the S Pen presumably. Graphics artists often draw on a stylus-enabled tablet that is not a screen - having a separate screen means you don't cover up...
Source: https://www.gsmarena.com/samsung_patents_describe_gameplay_on_foldable_phones-news-28734.php
