There are instances when a GUI file manager just won't work. When I run into those situations, there are several terminal-based options I go for.
If you feel like you aren't managing your tablet time to the best of your abilities, there are apps that can help with that.
You should never have to work with the root user account on Linux, especially on a desktop installation. There can be occasions when you need to use root on a server. If you must use root, do so with ...