There is diferent damage abilities, its true that Retris can't spam, but all they need its to use other abilities while waiting for little cds (this abilties that u cannot spam, make a lot of dmg), there is other abilities that makes a lot of dmg but need to be casted. Then there is classes like Ferals and Rogues who can Spam but Mangle and Hemo isnt the best dmg ability, so all our dmg is in Shred and Backstab that we need to be behind the target, sadly, ur right and rogues can just get 2 No'Kaleds and hemo spec will be worth, but still Ferals and Rogues use energy, so is not that easy.