Currently, HubSpot's Mobile App only supports the viewing of the user's own tasks assigned to them as compared to HubSpot Desktop where teammates can see all tasks (not limited to their own) as long as they are added to the shared queues.
Definitely seems like something that can bring value to team collaboration especially for customer's who are always on the go and relying on their Mobile Apps for task visibility.
It is indeed a very useful feature to allow all agents to see all tasks in a queue as all can be prepared and at the same time support each other in achieving the team goal together for a particular queue. Agents are not sitting down all the time, hence if this view can be enabled in hubspot app, it will be very useful!