The common theme is trusting your team. Trusting them to hold the postal open and clear a path. Trusting them to distract/kill boomers and stagger crota. Trusting them to hold the plates and kill the right adds quickly. The role of relic/sword/runner isn't about difficulty. It's about trust. If your team does their job right, all three are a walk in the park. If your team fails, suddenly your job becomes hell.