"Just sim it" is a phrase almost everyone who has played World of Warcraft in the past few years is familiar with. Should my enhancement shaman use Tunic of Failed Experiments or Voltage Source Chestguard? Sim it. How much of a DPS increase is the four-piece Firelord's Vestments bonus? Spreadsheet it. How much DPS am I losing since I can't afford a Flask of the Winds on my hunter? SIM IT!
I'll be the very first to say that saying "just sim it" isn't a constructive thing to say. Beyond being slightly rude, it doesn't explain why simming is such a good idea. However, while I find "just sim it" to be in poor taste, the actual act of simming or spreadsheeting gear choices is a really good idea. This post aims to address why we encourage spreadsheeting your DPS choices.