This isn't about wasting time in real life. This is about the game. If you rush, you shoot more enemies. Get more rewards. Plain and simple. If you don't rush, you're slowing the team down and wasting their time. Plain and simple. There is literally ZERO benefits to killing trash mobs. Zero. I've yet to be proven wrong. Just because you want to play slower and stretch out the strike for a longer time to beat while other people have already moved on to other strikes? Come on dude.