you just decided to post them even though it would be helpful to someone like me but to me it seemed like you didn't have anything to say regarding op.
Those links are definitely useful. There's nothing wrong with not commenting on the OP post either. Not like we have to do that just to comment on the thread to begin with. Is there a reason why you comment on this?
-snip-
In his/her defense it must be said that he/she expressed his doubt politely, and not as we are used to seeing when other users think that certain post is off-topic.
But I definitely agree with you: not only was the post on-topic, but also of great value.