Re: "Pager" page-up and -down, why not merge?

[Richard M Stallman]

    seem to be an improvement over the existing definitions of scroll-down  
    and scroll-up in emacs.  In particular, hitting sequences like [next]  
    or Ctrl-v followed by [previous] or M-v leaves point in the same  
    place, which is very calming.

That in itself is a good thing, but ISTR that the simple
implementations of this had bad effects in other cases.
To do the job right requires something much more complex
which people usually don't bother trying to do.