It is my stance that icons should, as best as possible, only complement textual information, and should not be allowed to replace them. Reasons for this include:
The icons used may not have universally-understood meaning. For example, can mean many things, depending on where it is located, and the history of its use, and thus have accumulated a number of meanings that may not be immediately clear to viewers.
When icons and other stand-ins are used in place of actual textual information, a legend must be provided. This is what I used for the so-called flags in the list of scenes.
Icons on their own take more time to interpret, because viewers must make extra mental effort to derive meaning from them, and if they can't do that, because of the need to look it up in the legends.
Technical-wise, sprite and FA-based icons used in HPW are not supported by mobile displays. They would not be able to see them. Relying on only icons is therefore a really terrible idea.
I thus urge people to really think twice before going on a iconification spree.