Awyndel wrote:But you don't chose between stamina and mitigaiton/avoidance on just about anything but trinkets. Ofc there are some minor choice on gems/enchants, in wich case oppertunity cost is very interesting, but their total outcome won't make a very big difference.
Don't discount the swing that gems can provide. Sure, it used to not be very much when you were talking about pure stamina in half your slots, and then sta/something in the other half, but now we're talking about pure mastery in yellow gem slots, mastery/sta in blue, and parry/mastery in red. Contrast that with pure stamina in blue, mastery/sta in yellow, and parry/sta in red, and you could swing, say, 270 stamina with ease. That's about 5k health. With trinkets being maybe 10k swing (each), your gemming strategy is about 20% of your overall decision. Moreover, you don't really have to decide on your trinkets; you can switch them from encounter to encounter. However for most folks their gemming decisions are pretty well fixed unless they take the time to gather a second set of gear, so more thought is warranted for making it optimal for the largest variety of encounters.
Finally, there's a choice between stamina and mitigation/avoidance whenever you choose to use a lower iLvl piece over a piece with a higher iLvl. This isn't as rare as you'd think because mastery rating is just so good, and some pieces aren't itemized well for it.