I think it's a little silly to respond to five different posts in five different posts and then immediately post two more posts and then end up quoting one of those, responding to yourself. There is an edit button for a reason.
That is your belief. My belief is it's a basic rule of bon ton. If you quote just the person you are responding to and respond to just that. Instead of mixing in and involving everybody. Unless the whole thing is of low grade in the first place. Then i agree a long wall of quotes makes more sense.