Yes but in return you get rank ups. To be completely honest you'd probably get the most from running the strike playlist and using glimmer consumables, you'll get engram's in the strike and can use glimmer to buy more.
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No because your not guaranteed to get gun engrams from strikes, they could be armour
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Still id be willing to bet two hours of strike playlists would net more then two hours of glimmer farming.
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I guaranteed you would not get 200+ weapon parts from 2 hours of strikes, average strike is around 10mins than make 12 strikes (that's not including time spent in orbit) you won't get 17 weapon parts a strike
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If your in a fire team strikes take 8-10 minutes and the next strike starts almost instantly, and to top that you'll max glimmer in about an hour so you'll be able to buy about 50000 glimmer worth.
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The Flaw in your post being the word "fireteam" not everyone has 2 people who want to constantly run old strikes with the new dlc and trials out