And they are right because of a simple argument: Nobody wants to spend a long time reading and listening in times of information overflow. This is reason enough to reduce the text in your mailings and phone calls.
But be aware of reducing too much! - Many people are very quickly in adding interpretations where they lack information.
Here is a sample conversation via SMS I faced two days ago:
A: I would like to pass by for a short talk. Do you have time now or are you busy?Person A interpreted the response that B has time after 9:45 and is busy now (maybe because of the short response). A passed at 10:30 and found B busy because B meant "After 9:45 I am busy".
B: After 9:45
What has to be said must be said - not more and not less!
Wrong interpretations others get from your information can be very dangerous!
Related posts: Blog post lengths or how to write, Information Overflow, The time bandits, Importance of collaboration, Hot air, People and Information.