It's actually not. Per the math that others have done, each mob gives you a 10% chance of an engram. Of that 10% chance is a 60/25/15 conservatively. That means that you have a 2.5% chance per mob of getting a blue engram to drop. Compared to my 100% chance, 200% chance or 300% chance at the end of the mission. Statistically speaking, your argument dies, right there. Per the Mars mission, itself, you have about 80 mobs, that gives you a CHANCE, statistically speaking of 2%., however, when you take the extra 5 minutes to farm, you've now increased that % value to 2.5 but, you've also added 1/4 of the time it takes thus ultimately costing you...Thus overall, lowering your chances at an engram if you're doing multiple strikes. Say I do 4 strikes in a row, all take 20 minutes and you choose to farm sporadically for 5 minutes a run. You've now cost me 1/2/3 engrams because you've taken up an entire strike, farming for nothing. You won't win this discussion statistically speaking because the numbers don't support you and you're welcome to your opinion but, mathematically, you do NOT have a better chance at an engram by farming...You have a better chance of an engram by completing the mission in a timely manner.