Google Chrome on a 13” MacBook Air almost fills the entire menu bar on its own for me — you don’t need that many notification icons before some start disappearing. (I also think Google Chrome has way too many menu entries, but that’s a different discussion.)

Also, the fact that a menu item that doesn’t fit on the left of the notch by 1px has to move to the right as a whole means that the notch effectively takes up a lot more usable pixels than it seems at first glance.