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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Most D2 strikes have painfully low enemy density which is why it's harder for players to hit 100K on Hero difficulty in Nightfalls or just to complete bounties. Devil's Lair has great enemy density though, but that's a returning one.