@Meddler about the AD buffs to the meele classes

Why does Riven get a buff to her w und e? It wont really help her waveclearing in any way. If you should compensate a Riven for losing 15 AD in the early game , just buff her Q by 5 ad and not her e and w. Can you explain me the reasoning behind this decision please? Like other classes like Fiora or J4 got buffs to their waveclear , but riven doesnt.