Dividers

Question: where is the evidence if full width (full-bleed) vs insert dividers to divide table rows and cells?

I've read Google's description of this. But what's it the evidence insert dividers improves readability? Apple clearly uses this on their Apps (including the 2019 Apple Health redesign). How has this been tested?

https://material.io/components/dividers/

https://uxplanet.org/visual-dividers-in-mobile-ui-design-53208de5426f