Yeah, that's how I was doing it before I started down this path. However, when I started rebuilding my App from scratch, I decided I wanted to avoid the Flow. In my previous build, I was relying on rough-guess timers to be able to accurately navigate screens based on Flow successes/failures - perhaps unnecessarily?
Thankfully my Person field is a People field... again, hopefully we get general availability of patching-to-null soon.
In case anyone finds their way here. I think they made some changes to PowerApps that now allow the Blank() function to patch a blank value to people picker fields. You do need to have the experimental feature turned on though.
In my case, I was trying to clear the value from a single select People Picker in order to return an item to a general queue where it could be reclaimed by another. I was working with the items inside of a gallery, so you may have to alter it to fit what you need. What ended up working was: