aatrox came out when riot wanted to lower splitpushing. WW is still a strong pick in low elo ( which i'm in :( akali just didn't have counterplay but she is still a good pick but you need to remember to auto once when they got your q
Why wuju go drain on something that's naturally already tanky?
Aatrox and ww are drain tanks yes because they have a standardized heal on hit no matter the enemy's resistsances.
Akali and graves are not drain tanks because their healing is based off of damage done. Which in turn is based off of the enemy's resisstances. ( akalis spell vamp is dependent on her targets mr) ( graves lifesteal or heal form deaths dance is based on targets armor)