So what about the people that aren't doing the strikes for the grind? What if they are there solely for the rep and the marks? Or what if they are grinding through the Bad Juju bounty? The entire community isn't in search of engrams. Chances are that by the time you catch up to the "racers" after killing all the adds on the way, that you'll still be able to put a few rounds into the final boss and get your rewards.