From my limited testing, I was able to get the dashboard filters/prompts to work for reports that I created while in Canvas Dashboard. If I added an existing report that was created in the standard report , the filter would not apply to that report. 

We have also struggled with the lack of notification on for approval results - specifically around when you submit an object for approval and not receiving a notification if it was approved/rejected. I created a flow in Fusion to do a tagged update to force an email. If you want to create a report o...

Just to add some more feedback here, I have the same concerns that you both have brought up regarding losing the ability to customize this area. We are not on the unified experience in any environment but I am able to see the toggle in Preview. While I do think the Requests area could use some impro...