One I actually use a lot is "My Flow". I find it incredibly useful for passing things between my computer and my phone. I have some mobile-only apps but I hate typing on my phone keyboard so like to type it on my PC first and then send it over.

The request I have would be to copy the text to the clipboard upon tapping the notification when something has been sent to the phone app. It would save 2 or 3 taps and about 5 seconds at least each time, which adds up when you use it as much as I do. It would also mean I wouldn't need to leave the app I currently have open just to copy and paste some text.

It's only a small feature, but hopefully it's one that would be easy to implement and would be useful to many people!