It's no secret at this point that lots of people don't stick around after round 10 or 20 in Onslaught, and Bungie is (hopefully) going to do something about it. I really hope they don't do suspensions/timeouts for leavers, but instead incentivize people to stay. This could mean many things, but off the top of my head, benefits such as escalating shiny rate, escalating chance to be your attuned drop, and even just more drops as you get to higher rounds would all be great ideas.
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#destiny2
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If there are only 5 bosses it shouldn't be that much work to add an extra chest each run or even double the rewards each round. It would be cool to guarantee a shiny weapon once per week at 50, which also would increase the engagement. But to be fair, sitting in a single activity for over an hour is more than most spend in both Raids and Dungeons, so I can't imagine doing a full run more than a couple times a week.