I found NC to be useful because me ex was manipulative. I needed that headspace to work out what was really going on. I was far too wrapped up in what he was saying and he had a knack of twisting things so much that I didn't know whether I was coming or going.
I would always suggest NC in situations of manipulation and/or abuse because having a rest from the BS (or more serious abuse) helps get on an even keel. It is also invaluable in seeing what the ex does, rather than being swayed by what they say.
If having contact is working for you, then that is a good thing, no? You can always revisit it later if it no longer works.