User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-5189447-20150529124653/@comment-1038387-20150529130948

They've only fixed things that were broken (though some parts could still be updated). If you mean reverting Breakpoints, Breakpoints fixes a problem that arose because of (improper/impractical use of) Fluid Layout.

As 452 noted below, the numbers aren't one-sided.