Don't think only "current" characters count, cause I got two nodes from year 1 complete in my book, and all my current characters has been created during year 2 and year 3, and myself have not gotten the "Doom of Oryx" node completed, and as it seems, it is because I also did not play between release of TTK and the April 2016 update, which then makes Bungie at fault for stating that that node should be achieved by doing an activity between TTK release and Rise of Iron release, rather than saying it should be between TTK and April 2016 update.