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Because a task assigned to three people is assigned to nobody. Each assumes another is moving it, nothing happens, and the status stays green until the deadline arrives.
A task can carry several assignees while still naming one accountable owner for whether it gets done.
One assignee is the owner; the others are collaborators. It appears in every assignee's queue, but the accountability is unambiguous and reporting attributes it to the owner.
Two engineers pair on a migration. Both log time against it, both see it in their queue, and one is named owner so the standup has somebody to ask.
It will not make a group decide. If a task genuinely needs three people to agree before it moves, that agreement is the work and deserves its own task.
The estimate splits across assignees for capacity so the same hours are not counted twice, while logged time attributes to whoever actually logged it.
No. The estimate splits, or you set the split explicitly.
Yes, and the change is recorded.
Yes, though only the owner is chased.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.