Rilgon says so. His argument is that basically there are no hunters that won’t gain the full benefit of every single type of proc we’re eligible for (which is agi, crit, or AP), and there are other classes that could become ArP capped or crit capped. Go read his post- the whole story is more level-headed than the way I’m making it sound ;)
So is Deathbringer’s Will hunter loot? My guild uses DKP, so while that means I can bid on leather if it pleases me, I have to compete with anyone who wants this trinket, regardless of whether they’re crit or ArP capped.