(a) You can't take seeing their name, but you keep them in your contacts? Don't you occasionally scroll past it with a call button right there, which is just as easy to hit and put you in touch with them? How is this any different? Seems a bit silly.
(b) As far as I know, research suggests hyper-avoidance is not a good way to resolve trauma. So I'm not convinced by the idea that this is harmful, especially when you can control it through (a).