So your own answer with your own quotes. They do look at the top clears and they do tend to balance considering the top. Therefore, if a 10000 barb clears say 140 and at that time wiz was doing what 143-145? They may nerf the barb. Now the situation is Wiz is actually about to clear 150. Add their nerf they are capable of 147 on top.
Where does the 7GR nerf to barb leaves? In the dust. ONCE again
As we claim multiple times, balancing around the top clears (1% of the playerbase), leave the average players (99% of the player base) in an extremely unbalanced state. Buff numbers must be set using average numbers instead of the top clears. Top clears tend to show erroneous behaviour, which underestimates the buff levels for average playerbase.