A lot of good writing advice in this memo:
The key person to think about is the reader.
People generally read only one screen and SELDOM read more than two screens. (A screen typically is around 300 words.)
A long story on a complicated topic can save readers time if it replaces the need to read a lot of short ones.
Readers either want to have a quick piece of information or something that justifies the longer read.
A good rule of thumb is that stories should either be shorter than 400 words or longer than 900.
Taking 700 words or 800 words to make a single point will just annoy readers.
Keep it short. Think of the reader.