Wouldn`t you be a little curious about what`s already been addressed (other than the primary post)? It might not be a bad idea to NOT reiterate someone elses`s point (unintentionally). Even if its original to you.
Besides, it doesn`t take very long to scroll-down (you might even notice a friend has posted just before you). However, It might improve upon"disjointed" and "off-topic" ramblings. As it appears the further away you are, (from the main post) the less relevant the input.
Either way, I wouldn`t mind.