I haven't used it for a while, but I believe that MindGenius Online should cover most of the points you mention; scroll down at the page below to see the views it offers :
https://www.mindgenius.com/mindgenius-online/

One word of warning: IMHO, unlimited levels of subtasks _don't_ combine well with mind maps which generally offer sub-optimal use of screen real estate. That said, I recall MindGenius offering a complementary bird's eye view of the mind map, allowing one to focus and augment the detail in specific areas of the map, while still maintaining the overview.