Curious to learn more about what drove the decision to add a larger breakpoint? Is it more you wanted to control the layout on larger screens/stop things growing too large or something else?
Setting a “max-width” for pages is coming soon, and will stop things growing past the max-width 
Side note - I guess this is something we all do only once 
. I know I did this once or twice when working with responsive design. Took me a little while to remember everything cascades down from the largest breakpoint