The stat weights only tell you which stats would give you the best benefit from adding it on top of your current gear, as such it's more of an advice for gear upgrades than showing you how to reforge. If you run reforge plots with your simulations you would have found that you would lose more from removing haste than you would gain from adding crit.
The stat weights u got from simcraft were the stat wrights with your current gear, and are there to help determine possible upgrades i believe...someone correct me if im wrong.
Ill give mu lock as an example, when i sim my lock mastery is better than haste but if i reforge in accordance wigh stat weights from simcraft and sim again haste will show much higher than mastery, because mastery only becomes better after a certain amount of haste. understand?
Yeah, I understand now. Also with the help from guildmates and thinking twice about it, I realized how the stat weights are dynamic and change depending on how much of a stat you currently have