Our brains are complex entities, this treats it as a simple one. I think it will leave a hole in continuity and it may well be helpful, but residual awareness that something horrible has occurred will linger and it will be harder to resolve.
I guess what I am trying to say is that the body remembers, even if we manage to pluck out one simple way the body goes about remembering. This may trigger reactions to certain stimuli which will make less sense when the person cannot relate it to remembered trauma.
I think PTSD is something you have to work on, and get help for. I did eventually for mine but years and years of not having any treatment.
This is the McDonalds solution.
A terrifying branch of this is the military's interest in using it in war zones.
It fills my mind with images of soldiers getting "reset" on a frequent basis. What would they be like after a year or two of that? (I have also read ideas on preventative drugs to help a soldier not remember).
Humanity, whatever someone is able to retain in a war zone, is the last defense against atrocities. The remembrance of atrocities is the only way to bring them to light later.