: Why is bumping (writing comments under forgotten topics) bad?
: If you write something under not updated for a long time topic it will jump at the start of topic list and will move down newer, more important topics. If the post wasn’t updated during months, there is a possibility users just forgot about it and possibility that they don’t need to discuss it anymore (You can check this by previous posts). If you have something important to say — write, but make sure you will not disturb anyone with something like “I agree with you!” , the 
button is there for something like that.