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

https://highstylife.com/why-does-too-much-movement-on-screen-make-it-hard-to-follow-the-main-event/

On a phone, a manga page and a casino screen compete for the same scarce space: your attention. Strong focal points guide the eye, readable controls prevent squinting, and smart contrast keeps details clear without clutter