I have been replacing any cards that rely on a dice roll to work for the same reason. I want everything in my hand to DO something when I play it, not have a chance at doing something. There is already an element of chance in drawing appropriate cards, by them also needing a dice roll it slims those odds even more.
As an extension of this logic, I am trying to keep 'Reaction' cards to a minimum unless its something very common, no more than 2 or 3. I keep trying to tell my friend this but he keeps playing games staring at a hand that he cant use, waiting for that one situation to come up. Keep those card choices generic I say, especially for our poor Reavers.
PS this is not advice to you specifically Mr Biboune you seem to know what you're doing better than me, just something I was thinking about today rightly or wrongly.