I would like to see both my tasks and my calenders on the same page
This would be extremely useful. Having calendar entries and tasks on one page, like you do in Windows, turns this from a "me too" calendar feature to a fully functioning time management tool.
Have several clients that use Mac and have moved them all to O365.
One of the biggest complaints is there is no way to see TO DO bar above the Calendar. The second biggest complaint has to do with importing iCal events into Outlook calendar to remove iCal from use and go exclusive to Outlook.