Yea, that’s snapshotting, what do you do about back ups?
Good old --no-preserve-root 😅
According to the PS4 user guide (https://manuals.playstation.net/document/en/ps4/settings/controlleroff.html) it can be done, so I reckon it is either a bug in the linux driver or in the Steam software.
Great blog post, give it a read.
What you are looking for is some kind of on screen display overlay.
I found this, see if it can be of any use : https://github.com/vascofazza/Retropie-open-OSD
Which is also 14 in binary.