For example if I had a maximized caja window in my first workspace and I shut my laptop lid, there is a non-zero chance that upon opening the laptop later and waking the machine the individual who opened the lid may be able to briefly see all files / documents within that caja window *before* the lock screen is showed.
EDIT: the second paragraph should read:
For example if I had a maximized caja window in my first workspace and I shut my laptop lid, there is a non-zero chance that upon opening the laptop later and waking the machine the individual who opened the lid may be able to briefly see all files / documents within that caja window *before* the lock screen is showed.