I think you deliberately miss the point and pick my wording out of stubborness to prove that stamina is useless.
Since in the original post I included a second trinket in the discussion (heroic apparatus) which gives strength as a primary strat, I believe it is crystal clear, that the discussion is about if mass mastery will help an arms warrior get a killing blow. The reason I started this discussion is because crit is considered the best secondary stat for pvp arms warriors. I don't challenge the general consesus. I am convinced crit gemming, enchanting, reforging is better than mastery. However I wondered what if there were special circumstances (see the quote below) where a warrior adopted such a playstyle that mass mastery was better.
that playstyle was very specific:
The specific questions are:
For those 12 seconds of recklessness and 20 seconds of mastery, will someone using the above playstyle do more damage than:
3287 haste? Haste doesn't affect bladestorm (correct me if i am wrong) so the answer is yes
2419 strength? (pvp on use trinket) Could be I don't know the answer to that yet
517 strength and 3287 crit? (
http://ptr.wowhead.com/item=77992) I don't know but my impression is yes because recklessness and base crit is already enough. It seems to me a case of diminishing returns
Finally regarding stamina being completely useless. It can add 10000 hit points which would mean slightly better self heal capabilities but most importantly a safety treshold for your healer and a psychological discouragment to attack someone with 170k or 160k hit points.
EDIT:
To answer my own question I did some testing with full ruthless gear + apparatus normal. 5% hit and everything else reforged to mastery. It seems that on ressilience targets the numbers are like:
Bladestorm crit tick 7-14k depending on res
Strikes of Opp crit proc: 5-8k depending on res
Given the rotation charge, recklesness + apparatus 5 stacks, MS (for enrage)+ CS + Bladestorm I get 7 bladestorm ticks, about 4 white hits and about 6-7 extra attacks proc.
So in an average scenario with 50-55% crit (from reck) the total damage is like 18k MS +6k CS + 55k Bladestorm + 18k white damage + 24k strike of opportunity totalling 121k damage without counting deep wound ticks.