Hobgoblins are a glass cannon, they're extremely easy to critical and can often be killed long before they get to use their shield. Typically they don't move around either, making them all the easier to kill. That being said, with the shotgun buff in PvE making Minotaurs a joke, hobgoblins are still one of the more dangerous vex enemies, we really don't need to make the vex easier to kill.
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Killing them is easy enough, surviving their damage when it's 25 of them shooting you at the same time.... Well that's a different story altogether.
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Strafe, snipe and cower. If there are a lot of them and/or axis hobgoblins, gotta hide and take potshots. That's why they're called glass cannons, they're meant to kill you quickly if you give them the chance. Gotta avoid giving them that chance.