Writing short posts is in my opinion a good way to motivate people who do not have too much the time to write length posts to write, as well as it could potentially attract new users as the format is very popular on other platforms (like Reddit, although I am not on it myself and I only report what I heard).

Personally, it was also a way to attract new followers who had probably never heard about me and what I write (restricting myself to writing about science in the science category). I guess this feature is also true for others.

In order to continue the personal story, each upvote counts, but comments are more important to me :)