[seren]

The only upside I can see, is that if you are updating very often a presentation while collaborating with someone else, it is easy to keep it under git.

[hk__2]

There are other tools that let you write slides in MarkDown, which is then compiled to HTML to be rendered in a browser: https://github.com/search?q=markdown+slides&type=Repositorie...

[frogcoder]

or you could collaborate your presentation using 3d. that also would be easy to track under github.