This question had certain comments by 2 users( JeffE , and scaaahu ) which although were not strictly on-topic, but nonetheless added to the discussion by providing a different viewpoint. Why were they removed ?
I'll take a little less of a hard-line stance than EnergyNumbers; comments often add a lot to the discussion, but oftentimes users request that off-topic flags be deleted to make the answers cleaner. I suggest the following:
If you have something to say which directly related to the question and is not a request for clarification or more information, post it as an answer.
If you want to add something to an answer, you can either add that point as a comment, or if it's appropriate, edit it in!
If you want to clarify a point related to to an answer, add as a comment.