I love Onslaught and love how long it lasts, but over an hour without checkpoints like in Raids & Dungeons can be kinda brutal, it's nice to be able to step away for a minute when someone needs to go to the bathroom or a whole list of other reasons, but since we get kicked we NEED to keep one person there and to do everything in shifts rather than just stepping away.
And since it's not matchmade there shouldn't be an issue.
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Not as many people need breaks as there are that would exploit that.