If you find yourself typing a long comment that might have contradictions or presents several options, you should consider shortening it so that it only contains the most important point. Save the rest for follow up conversations. This makes a better conversation for several reasons besides voting.
Fair enough. I can see how I could save myself time and effort. However, I've read many long comments in the past that are very interesting. And, considering the 90-9-1 rule, I suppose this happens to other people too.