Just tried to complete the weekly set of bounties from Zavala and it took me 8 strikes. I mean, the sandbox has evolved over time in a way that us guardian have a lot of ways to kill and that's an issue in strikes where enemies are just too weak and there's not much room to farm the bounties objectives when you have a speedrunner and a guy who's trying the new meta build for this season as teammates. Just add more enemies and new difficulties for strikes or adjust the bounties objectives accordingly.
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I'd never try to do bounties with trashberries. I set my click forward and solo the strikes.