For a LightMovement 10,000iteration fight, i am simming 90634 dps with a haste-dominate build (hitting the 6637 haste breakpoint, only leaving 4689 mastery left) and am simming 90293 with a mastery-dominate build that is only hitting the 4717 breakpoint. All other factors are completely equal with both builds except the mastery/haste ratio.
The purpose for my question was to inquire about the locks, top-tiered locks pushing heroic content and consistently ranking WOLs, who have (what seems to me as arbitrary) around 5100 and 5200 haste rating. After studying the spreadsheet, I quite literally see no reason to stack haste anywhere near 5100 or 5200 (im talking five-thousand, not the 4198 cap). There's a breakpoint at 6400 and then the 6637 breakpoint, but between 4717 and 6400 i see nothing. This is puzzling to me, as all forums and conversation on the topic seem to also ignore this cap despite seeing it so commonly reached.