Take using a computer to type a word versus draw a picture: Effectively everyone who uses a computer can type a word, but I'd bet less than 10% could draw a circle.
But put a piece of paper in front of someone and effectively everyone can draw a circle.
This points to there being a limitation in the technology for working with other forms of media, not the effectiveness of the communication medium itself.
This isn't to say that text isn't also a better communication medium, but it is to say, until the technology has improved for communicating with other media, it's difficult to compare without basing the decision on the limitations of the technology.
In other words, most of the perceived advantages of text are really advantages of text being easier to represent digitally (or generally reproduced, e.g., printing press), not advantages of text as a communication medium itself.