Again, you do not understand, please try to understand.
The point is very very simple - the biggest claim against mastery is that you supposedly can get screwed up by low roll during key moment of encounter and as such Versatility which mathematically is worse than Mastery is supposedly better because it provides stability.
Our counterpoint is simple - just as you can get indeed screwed up by Mastery, so can happen with trinkets, crits and just about bloody whatever RNG existing in your damage output. So saying THIS is the reason for Mastery being worse than Versatility simply does not fly, it is a very weak reason.