Weighing in because I came here searching for a solution to this problem. Using subtasks as a way to assign a single task to multiple people is a workaround we have started incorporating, but this is still not ideal. Subtasks play an important role for many of our team’s tasks, and so I have to choose whether to make use of them as subtasks or sub-assignments. I’d prefer to have both options available, because otherwise things can get messy (i.e., multiple ways of assigning a single task to multiple people = confusing).
As another aside, I don’t mind making copies of tasks, but there doesn’t seem to be a way to link them (unless I’m missing something). Therefore, if I assign one task to 5 people, but later want to make an update to the task description, I’d have to make it individually for each task. This is frustrating, and is a reason I’ve gravitated away from assigning copies (in most cases).