Re: vertical scroll bar should disappear if everything is displayed

[Richard Stallman]

    On most applications, scroll bars appear only when there is text to
    scroll - that is, they appear only when needed. Emacs should behave
    normally in this regard.

This would be very hard to implement; and the changes in window width
could be quite annoying to Lisp programs.

    In a buffer whose text does not fill the full window vertically, the
    vertical scroll bar should disappear.

You CAN scroll the text in Emacs when it does not fill the window.
You might not want to, but you can.

The only time you cannot scroll is when the buffer is empty.

    Similarly, there should be the possibility (via an option) of having a
    horizontal scroll bar appear when text would otherwise wrap or be
    truncated,

We have had finishing horizontal scroll bars in etc/TODO for over a
decade.  Maybe someone would like to do it, after the release.