If you start a strike, heroic or regular, you get matched into a team. And being a team means working together, not repeatedly trying to run past all the enemies while the other two work their way through them, and dying, leaving the other two to kill all the enemies while you wait to respawn
Seriously, i've had 5 strikes today where someone kept trying the "mad dash" tactic. If you're there at the start of the strike, you shouldn't be ending it with less than 30 kills while i've got over 170
(Edit: the point i'm trying to say here is pull your weight, and work with your team. Don't be some idiot that runs off by themselves, dies without even reaching the next checkpoint, waits to revive, and then repeats that process multiple times in a single strike. It's basically the equivalent of sitting in the back doing a dance emote while the other 2 players are killing their way through
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Most people are only doing strikes for milestones or exclusive items. You will be hard pressed to find anyone that wants to spend 30 minutes on a strike killing everything, just to get nothing for their effort. There's zero incentive. Don't blame the player, blame the developers.