Steve,

          "Critical" is in the eye of the beholder.   Also, a great many people prefer to use a "screen reader agnostic" access method to the system tray, WinKey+B, then right arrow through.

          There are many roads that lead to the proverbial Rome as far as accessing the system tray.   Some people like to be able to impose a display order for the functions that they intentionally keep on permanent display there.

          I have no opinion as to whether it's critical or not, but the information being shared about what's possible, both via keyboard manipulation or requiring a mouse and sight, should be accurate.
--

Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763  

   Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

         ~ H.L. Mencken, AKA The Sage of Baltimore