Becuase the reset progress option in the settings doesn't cover everything and things like secrets found and statistical records don't get reset.

So is there anyway to do this?

Uninstall and run a clean re-installation? It's cumbersome but it's not like the "keeping your saved games" prompt does much in your favour if indeed the reset progress option doesn't do a full reset?
Or maybe the DEVs need to actually fiX that option... :D