That’s great feedback. Currently there is no way to assign multiple people to the same task, and this is by design to ensure there is always a directly responsible individual. You can read more about this decision here: Why one assignee?. You can always loop additional folks in as Task collaborators or in subtasks, but the intention is that there is always one person who is responsible for next steps on any given task.
We do also have an “Assign Copies” feature as a solution for times where you want multiple people to do the same task, but these are copies of the task and not the same task in itself. You can see more about this here: How to assign copies of a task in Asana.
Are there other cases where having more than one person responsible for the same task is crucial for your team?