If you have the task selected and open the summary panel from the project screen the popup will allow you to assign to people using the enter button.    

dates are formatted as YYYY-MM-DD I believe.

I haven't noticed one. I just tested and was able to delete a comment from 2021.

Sometimes resetting the notification will help. You can try turning it off and then on again for the group or system.    Also, make sure the project isn't in planning. It won't send notifications for projects in planning.

There is a template you can use for it but basically it's triggered off a tracked field change.     

I have reports that run with "admin rights" so that users can see all data in the system that need to see and those values are all replaced with No Access. Unfortunately, I have zero time available to update every report that was impacted and then have to consider the use case where someone looking ...

Are you asking how to do this natively in the tool? There isn't a way.   Or are you asking how to do this with Fusion? 

You are right it does gray them out in the task settings area however from the main project screen where most planners setup their timelines and do their planning, it does not.   All dates are editable and the only way around it is to control it from their view.    

Assuming I'm understanding the question... You want a report that will show review tasks of projects that resolve an issue submitted by a specific user?    You should be able to run a task report and filter it by Project Issue Originator with this text mode   project:convertedOpTaskOriginatorID=*inp...

I just realized you are correct, it's just an intro video. I thought they were more in depth than that. The tutorials area might be more useful. https://experienceleague.adobe.com/en/docs/workfront-learn/tutorials-workfront/home