Well whats app used to be mine favourite chatting app when it was under an indian. all the changes they do to it was upto the mark since it was sold to mark zukenberg after that changes like story replaces status and many people still not able to find their contact list on whats app.
All story you see get saved in your memory card without your knowledge and makes your mobile works slower because of those heavy data saved and many of us dont even know about that. so deleting everytime that stuff is difficult sometimes you deleted important data as well. they need to update in this matter so that what we see on whats app doesnt get stored in our mobile memory card.