I am not a good tank or healer but i like to do dungeons with the roulette. So normal content is just perfect for me, i am not doing expert runs. So why make the normal dungeon more difficult when there is a expert mode already?

And think about when dungeons should be more difficult, players will use tools like dbm in WoW, does this make sense playing like in WoW where players can not play anymore without all the addon tools?