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Kashalot and @
killor318: reguarding trinkets: we actually rank all items with procs directly from simulations for Legion, making it a very customizable and accurate way to rank them
A big improvement over WoD.
As for the simulations: they are very accurate* (keeping in mind that we might be fixing bugs or missed changes for a couple weeks after a big patch like this). Why can I make the accuracy claim - I'm from AMR afterall, of course I would say that, right? Well here's some info on our process:
1. We check all spell data to in-game tests. We do this because often in-game tooltips are wrong or changes are undocumented
2. We check spell data against actual logs from WCL. This is REALLY handy because I can match someone's gear and character setup from a log to our simulator. Then I can look and see that maybe every single spell is doing the right amount of regular and crit damage... except one. Maybe that one is 25% too low. That let's me take a look at the spell and see if there's something that should be buffing it, but isn't.
3. The spell wiki makes all of the data open source, and a lot of people view those pages, verifying our information (or pinging us if something is wrong).
TLDR: We veryify spell data from multiple sources, do dedicated testing, and the open source wiki is an accuracy source as well.