> Keep in mind we will still support the positional methods, such as .first, .last, and .eq. Anything you can do with positional selectors, you can do with positional methods instead. They perform better anyway.
Except half of the point of css selectors was that you strongly encouraged your coworkers to use similar selectors for style and behavior. Now you have two implementations of the same thing and over a long enough time horizon that always breaks.