Of all the ways in which information can be presented, videos and voicemail messages are among the most inflexible. While they can be quite good when you are fully interested in the subject matter and have the time to engage with them, they lack vital characteristics of written text. Notably, they cannot be easily skimmed to determine the degree to which they are relevant and interesting. They also cannot be searched for keywords, or automatically filtered on the basis of content. Whereas my emails are subjected to dozens of filtering rules that permit me to understand the content of many messages at a glance, no such approach is possible with videos or voicemail. Furthermore, they cannot be easily integrated into other activities, since they often require both audio equipment and privacy.
As such, I tend to set them aside (often for days or even weeks) and then go through all of them at once. As a result of this, they are an unusually poor way to elicit a prompt response from me. In order to make people more aware of this preference, I added a little coda to my outgoing voicemail message, suggesting that those wanting a quick response should try email instead.