Check your sources before producing something as fact.
Originally Posted by Nerec
At the time t11 was highest tier, mastery does scale slightly better as haste after the plateau. After several updates (BA Buff) in t12, mastery does scaled better than haste. How should haste be better with t13 2pc, which does reduce the amount of cobra shots needed even further.
The impact of haste on SV abilites are:
shorter CobS cast time
does pets even scale?
Mastery have impact onto following abilities:
BA / Trap
Nature Dmg procs (Vishanka)
In my last WOL Profile on Ultraxion Auto-Shot does 15%, Pet does 10% and just for the number: Kill Shot does 3%. Therefor haste is nice for 25% of our dmg, ~70 does favor mastery.
The goal of a haste plateau was to have a near focus neutral rotation which supports our Explosive Shot the most. Thus the best use of the given timeframe between 2 explosive shots. This leads to 757 haste + x modified through everyones latency to get as tight uptime between each Explosive Shots possible..
Don't forget that "Lightening Strikes" from Vial of Shadows also benefits from mastery and can easily account for somewhere around 5% of personal damage.
I would also point out that Thrill of the Hunt procs further devalue haste.