Because destiny feels more like a story,a continuation,then a sequel after sequel experience..I know with what we got it isn't as epic as everyone hoped it would be but I feel that it still can be. Then try to make "your" guardian so special ,it just seems kinda depressing to say "ok,you've been on this journey for 2 years now,with these character you've grown quite fond of.were gonna do away with them and you'll be starting fresh"