Quickly: Close your eyes, forget that you have already seen the title and intro to this week's column, and tell me the first thing that comes into your head when I say, "hardest pre-raid gear slot to fill." No, not bracers. What ... dang it. I mean ... come on, guys!
It's trinkets! Trinkets. Didn't you read the title? It's right there.
Though you have two slots free for trinkets, they have always been one of the most notoriously difficult to fill gear slots in the game. And no single gear choice is more subjective than choosing one trinket over another. Instead of choosing between 225 intellect and 255 intellect, you're often picking between a Vengeful Wisp and a Fallen Footman. That's a bit like asking which is better, shrimp tacos or integrity? I don't ... I don't know. Sometimes the only indication that one given trinket is better than another is the item level, and let's be honest, even that isn't often a very reliable indicator. The math can be obtuse and often a bit fuzzy, and even plugging trinkets into a damage-simulating program like Rawr can prove problematic.
And then there's the matter of finding said trinkets. Through each of WoW's three expansions, the relative difficulty of finding two good trinkets has been a frustrating constant. In many cases, you'll find solid endgame-level upgrades for every other slot while still waiting, an increasingly hard-to-ignore urge to kill swelling steadily behind your brow, for Paletress to finally drop the stupid Abyssal Rune, even though this is your 75th consecutive run and you've seen her drop the stupid hunter trinket the last 16 times ...
To compound the issue, there's the undeniable fact that no other single gear upgrade can improve your DPS as dramatically as switching from a crappy trinket to an awesome one. Those two slots are arguably the most important in the game.