Hello bw,
well, for me, you ignore two issues:
1. In case one has to prepare hundreds of graphs, copy/paste is not
really an efficient procedure
2. if one wants to prepare internet presentations, one has to save or
convert or whatever to an internet-capable image format, compatible with
as much browsers and generations.
Hope this helps to clarify
Best regards
David
In addition to these, and the comprehensive list Nick Cox provided, let
me add one more. PowerPoint files are the least transportable of the
current MS Office suite. I do not use it, but I often deal with students
who have prepared their presentations in PPT. They generally are _not_
cross-platform if any maths appear in the slides. A senior honors
student gave a presentation the other day in which he was not able to
get his Windows laptop to work with a digital video projector, so he
displayed it from the seminar leader's Mac OS X laptop, with Word X
(latest version); the maths were munged. There are ways to avoid this
problem, and ensure that a presentation will be equally usable by
colleagues with Macs, Unix, Linux, etc. They involve use of TeX, and
avoidance of PowerPoint.