Where is Planner Hub, Calendar View, Connect to Outlook

One available integration you might benefit from is the integration of the Message Center to Planner.  :) MC887371 announced what was happening to the features you mention, as noted in the other thread.  For reference: 

How this will affect your organization:

The following features will not be available at launch but will be available by early 2025:

• Open plans associated with a Loop task list
• Board view in the Assigned to me view
• Add Assigned to me tasks or a plan to an external calendar with an iCalendar link. NOTE: Existing iCalendar links will continue to work. New iCalendar link creation is not supported, and existing iCalendar links cannot be disabled while this feature is not available.
• Undoing the deletion of a task

As part of our efforts to simplify Planner, these existing features are not available in the new Planner due to low usage:

• Charts for pinned plans in Planner Hub
• While you were away notifications
• Activity log of a task’s creation, assignments, and completion date in the task comments.
• Links to group members, Microsoft Outlook conversations, and Microsoft OneNote notebook (you can still access these links in Outlook)
• Menu option to Leave plan
• Suggested attachments
• Charts view and Schedule view on the Assigned to me page
• Customized backgrounds for plans

The good news is that customized backgrounds should be coming back as there was a lot of feedback.