It is useful for mathematical and scientific classification work.

I attach a texinfo file, where @usec, @usubsec, @usubsubsec are defined as headings.

You can use "Show Branches", "Show Children", and "Show Subtree".  But they all force
the user to move point to a specific heading, i.e. there are no operations which are global
across the buffer.

And it becomes more problematic for "Phylogenetic Trees" and "Geological Trees", particularly
when lists are long.

Regards
Christopher


> Sent: Sunday, May 23, 2021 at 4:48 PM
> From: "Ihor Radchenko" <yantar92@gmail.com>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: emacs-devel@gnu.org
> Subject: Re: Cycling first N heading levels in outline
>
> > It would be helpful to have outline show the first N heading levels using
> > a keybinding that changes N after every hit (from N to N+1), then reversing
> > when it reaches the last heading (from N to N-1).
>
> Could you provide an example use-case? It does not sound very useful for
> me.
>
> Best,
> Ihor
>