I think the question can be best answered by addressing why chart are important at all.
Charts are important for various reasons:
1. Charts convey information is a way that is not propositional, that is, charts are visual. This is an important point, because some people are visual learners.
2. Charts also break up monotony for people who are more propositional learners. This might help if the presentation is long.
3. Charts also convey lots of information in an easy format. This alone is worth it!
4. Finally, charts can plot various variables on an x and y plane for comparison purposes. In short, one can analyze data effectively this way.
Powerpoint does all of these things extremely well!
Like so many elements that can be incorporated into a Powerpoint Presentation, charts can be extremely helpful. They can bring to light changes in production or reality and can highlight essential data. Their integration in a Powerpoint presentation can be quite powerful in convincing an audience of a particular point. There are some caveats, though. The first would be that including too many graphs and charts might border on overkill and tune out the audience. Another warning would be the idea that some elements of graphs and charts will come across as difficult to see on an Powerpoint slide show. If a slide show is meant to be projected on a screen, some elements of a chart, such as labeling of axis or specific data, might not be as clear or as visible as it might be if one were reading it in a book. This should be kept in mind when transmitting or transferring charts or graphs into a Powerpoint Slide Show.