On a phone, a manga page and a casino screen compete for the same scarce space:...

https://ace-wiki.win/index.php/What_Makes_a_Good_Establishing_Shot_When_People_Read_on_Mobile%3F

On a phone, a manga page and a casino screen compete for the same scarce space: your attention. This article looks at how strong focal points, readable controls, and thoughtful contrast help both feel clear without shrinking everything to fit