Crit value is for all spells to crit most of the time it is more important than mastery
due to emeber regen, and double damage of normal spell hits, whether we hit the 100% crit threshold that you have set is irrelevant. New tests with 50% crit and trinkets with intellect procs show an increase in damage. You are basing your theory on the fact that when crit hits 100% for a couple of seconds of the fight more important than having sustained critical strike damage from all spells. This is why you see destro being so far behind the other two specs. If you open your mind you will understand the significance of getting critical strikes with spells half the times or more.
In my test mastery did not equal or apply more damage than the critical strike of all spells
. This is simply understandable because a critical strike is 100% more damage for the selected spell, for an example if an incinerate hits for 150k regular it will crit for 300k or more. No amount of mastery possible will allow this to happen(in current gear). Mastery however isn't useless it is very close the crit and is the second most valuable stat between crit,haste, and mastery
. If you do not crit while prioritizing mastery, the crit that you are saying is our second best secondary stat is useless. To compensate for this loss crit should be atleast 50%+ so you can get the most out of mastery. Chaosbolt is our strongest spell but we have other spells that we use to sustain our dps. In order to sustain dps our other spells have to hit for higher damage. The highest damage one can achieve at the moment is critical hits+mastery which further increases the value of getting a critical strike.
The green fire doesn't set us apart from a fire mages, because fire is our element of damage as is it is for mages. Green fire is nothing, the original locks such as myself deserve more after the doom gaurd ritual and Dreadsteed quests we had to endure.