There is a common fury to use visual means as a support for communications. Seldom is any rationale given. Here is some argumentation against doing so.
Graphics are a means to avoid communications. Sometimes it is what you want.
Communicating means building a structure in the mind of other
persons similar to one in yours. It may involve restructuring
pre-existing information. It is a process which takes time.
The use of graphics, or pictures, or any global impressions, aims at
reducing the required time: it may do so by referring to information
already known to the other. It assumes the communications have already
taken place!
The main problem with this is that it is impossible to check that everybody has indeed understood the same thing --that communications have taken place at all. This is the basis for scientific (or simply rational) demonstration, falsifiability: the promise that the representations of theories are rigourous enough to allow the objective detection of failures.