You're missing the counter-ops potential. Suppose you were a member of
some underground group. You could erase parts of your own memory
after action so that if you were caught and tortured, you couldn't divulge
useful information to the black hats.
In fact, you could really mess with their heads by messing with your own.
Imagine your real memories and knowledge of an action were removed,
and the replaced with a false memory that would implicate the other teams