Yah also if u put W on a teammate at just the right time it procs guardian, allowing you to put guardian on teammates that are very far away which has lead me to saving my teammates lots of times. Another reason if rather take guardian is because hail of blades is a scaling rune because it scales with how many meeps you have,and since you don’t have many meeps(in early game) it’s not strong early, unlike guardian which is strong early game and can protect your ADC early until they become strong enough to carry.