Some writers want to express themselves comprehensively. They want to write it the way it flows from their mind, which is why their post most times are long. I am also guilty of this offense. I will have to improve my expression in the English language and also consider the length of my post because I will never want to be called a bot.
expressing oneself doesn't really writing some bunch of words to convince the reader, there are few words which you could just post that carry heavy meaning at same times summarized all you wanted to say.
When they said of spamming, it doesn't mean writing a very short words that results to spamming, you may write a very long and lengthy words but doesn't carry meaning would still results to spamming.