Oh, Denis!  I'm not sure myself.  I do know that part of the reluctance relates to the fact that each time that I write something, I am obliged to "rate" 3 different responses taken out of context.  I find the process wearisome.  
Another part has to do with the fact that I often preferred the comments to the articles.  The conversation seems a bit more constrained and a bit harder to follow now, so .....