That's besides the point though. With a self-contained HTML, you don't need to go to a special website, you don't need an account or sign-in, heck you don't even need the Internet, and it works pretty much on every device that supports HTML5.
a solution in search of a problem. everyone can open a powerpoint in google docs, hotmail, libreoffice etc.
now the person receiving the file has a DIFFERENT experience than they are used to with every other presentation. different hotkeys, different troubleshooting.