It seems people fail to see the big picture there. The dev team has plans for when people clear raid encounters and how many people clear it.
they design the raids and expect the top tier raiders to finish it in a certain time with a particular ilvl. And they do the same for midcore raiders. They now what ilvl most raiders are now and they said themselves that the damage going on was higher than expected.

If you cleared it before the nerfs or were close to clear it, congratulations, you are a top tier raider or at least in the above average of midcore raiders. The dev team just ended saying that you are above the average that they were expecting.

My static team was progressing in A6S and we can see the progress we make every time we raid. for us, these nerfs just mean we will move on to A7S sooner than what we anticipated, no big deal.