-geometry vs. font size

[Dan Jacobson]

On the man page:
       -geometry geometry
               Set the Emacs window's width, height, and position
               as  specified.   The  geometry specification is in
               the standard X format; see X(1) for more  informa-
               tion.  The width and height are specified in char-
               acters; the default is 80 by 40.

But shouldn't there be added words like "you won't get what you expect
if you change the default font size [in .emacs or .Xdefaults ?],
especially if started from an .xsession file.  The remedy is ... "
I wonder if the eagerly awaited --fullscreen will screw up to.
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