Your son to do crucible bounties for example, or just someone to run roc strikes for exotics....
It's cheating. Gaming the rng system. You get items that no one person could get. Why not share with someone in Australia so the account could be played while you sleep? You may wake up a level32!!!
Edit: I mean same character, not same account (although there is no need for that as, at least with ps+, anyone on the system gets ps+)
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It's the same with xb1 - only need one hold account for every account to play online. Sometimes my daughter plays on my account and so does one of my friends - because there is no split screen. I could care less if the raid, do bounties, crucible, or just run around killing stuff. I don't see it as cheating, I mean it's not like their hours played affect anyone else.