Regarding the meta gem and the trinket: The differences between those items is too small to empirically measure. If you took those same players and swapped the meta gems and had them do the fight again, they’ll get results that are so close you could never tell the difference, statistically.
This is one of my biggest gripes with the gear design in WoW over the years, btw. The differences in items are so, so, so small that you cannot empirically feel a difference, much less prove a difference.
Is my model “right” where everyone else’s is “wrong” about those tiny differences? I don’t know. No one can know. I do know that I’ve gone through the math in my model and it picks all the gear you would expect 98% of the time. Why would it be wrong about these two items if it picks everything else “right”?
We don’t consider classic-era items unless you have them. Trying to keep the amount of calculations down so the site doesn’t choke. Warrior is the slowest spec for calculations already.
Right now I don’t think there is a way for us to know what blacksmithing specialization you have, so you might have to manually exclude a piece that you can’t effectively use from a different specialization.