If you can hit a keyword and get straight to the point on a particular topic, what's the point of stressing things?
The more you write, sometimes it complicates things without the author even realising it. At the beginning, most of the long text might have meaning, but the more you read it, the more confused you get about what the person is saying.
I swear, you are completely correct, I have encounter so many posts that got me my interest to reply or give out my own perspective but got confused at the middle or finishing point, which will make me not to know what to say or write anymore.
That is why we should be careful on what we post here, and also get the right source of our information to enable people to know what to reply and also long post doesn't guarantee us to earn a merit, although it doesn't matter how long or short our post but since we know what we post and it can impact knowledge to people.