It is great to hear you are opening the gates for feedback!

I have investigated planner as a task management tool for our org, and I have some significant limitations identified that I think if addressed could improve your product significantly:

1- Create a "Supervisor view" screen: Your vision on a single place where all "my tasks" are visible is great. Now is time to go beyond and use the MS environment to list all the tasks of a supervisor subordinates, whenever they are (limited to plans, not e-mails). This will give supervisors a great way to balance work, check for updates on critical items and distribute work as required.

2 - Extend API integration for premium plans: There is a use case to connect other applications as PowerApps to planner and create/update tasks using the Graph API, however this is limited to basic plans. This fact limits the integration scope as some solutions need functionalities as custom fields.

3 - Improve custom fields functionality: A list of improvements that would be good to see... 

a) Missing a user picker option as a custom filed type, so not able to create a field with "Requested by" or "Help chain" and attribute its value to a person from the organisation.

b) In the Task view, not able to hide unused fields that are not used (selected hidden in Teams or Project view) could be hidden from the task view too.

c) In the Task view, not able to reorder custom fields. It would be better to bring custom fields up in the task view, since they are more important than standard fields.

d)Standard Columns - Created Date and Created By are fields that are already generated but not exposed to the users. It would be better to have an option to read them in the UX

e) Standard Columns - Status field is not available on the UX, why? Is Bucket the best name for it?

I appreciate you listening the users. I hope this is useful and addressed, so I can continue to advocate planner in my org.