I limit my laptop battery charge to 80% with a third party software tool. Laptops can generally bypass the battery and directly power themselves from the wall.
Does this new 80% battery limit setting imply that the new iPhones are able to do the same? Implication would be less battery wear while docked on a desk/in a car or due to long “AAA” gaming sessions, since it will draw power direct from the wall rather than using the battery as a middleman.
Most phones and tablets that do this simply keep it charging to 80, not stopping it there and bypassing, so that’s most likely what it will do. Having battery bypass would be a pretty big feature that they would announce, especially with the new big AAA games announcement.