Just thinking why your other characters couldn't play as AI and help you on strikes if you were playing solo.
Why not make it so you could swap at any time and play each of them in game during the same strike.
I'd love to have my Titan, Hunter and Warlock all attack a boss together with me switching out between them.
Live and dream.....
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That would be cool but considering you effectively have to log out of the game to switch character I doubt the code could handle it.