There are many ways in which Wiccan psychic protection might play out. The Tower of Light does not mess around.
It's like encasing yourself in a fortress, locked away where neither entity nor energy can reach you.
As psychic self-defense, the Tower of Light occupies a position right at the extreme end of things. Only an idiot would leave it up indefinitely, divorcing themselves from all that is and might be in our world of everyday wonders.
But as a knee-jerk 'get me away from THIS!' response, the Tower of Light is unparalleled as a Wiccan method of psychic self-protection.