It's getting to be a common thing now during the Lvl 24 Strikes that I see these kids race as fast as they can through the Strike usually hopping on their speeder bypassing the first several mobs of lower level enemies which is fine but then they continue on and bypass as many of the Lvl 24 enemies as they can just to get to the final boss quicker.
Why? The boss gives you nothing and your chances of getting anything worthwhile from the end game roll are poor odds for the amount of time it takes to complete each Strike. Your best shot of getting a Legendary Engram drop or at least multiple blue Engrams to give you a chance at Legendary gear and to rank up the Cryptarch is to kill every Lvl 24 enemy up to the boss because that is where all of my Legendary Engrams have come from and I get at least half of my blue Engrams from Mob drops to go along with what I get in the end game roll.
The Lvl 24 Tiger Strikes since the last patch appear to have a higher drop rate than the normal game modes at least in the areas you're facing Lvl 24 enemies, and so bypassing them to finish the Strike faster is just decreasing your chance of getting multiple drops. There's little other reason to be grinding Lvl 24 Strikes in that manner because you can earn Vanguard rep faster farming Patrols, Vanguard Marks faster farming Public Events, and if you need a bunch of Strikes for a Bounty run the Lvl 8 Devil's Lair on Earth and get them done quick.
So don't be that guy that runs way out ahead of everyone else. Don't waste you and your teammates chances for more Legendary/Exotic drops. It doesn't take but an extra 5 minutes or so to clear out all the Lvl 24 enemies your bypassing between you and the Boss when you do it as a group.
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By wasting ammo and time on useless mobs you give yourself a chance to get greens, maybe a blue, and if you're having an extremely lucky day, a single legendary. At the end of the strike you will receive Vanguard Marks, Reputation, and at LEAST a few blues if not a Legendary. So, yes you can spend your time thoroughly killing any of the mobs that will undoubtedly spawn in as soon as you leave using time and ammo (which you will need to actually progress within the strike) but you're going to make it harder for yourself later on. Whether you do it or not, you'll still receive the completion rewards. By all means, go for it. But for someone like me who does it for completion (and frankly, because it's fun) don't complain when we do what we do. If you get some Legendaries or something along the way, more power to you.