a nerf should be justified more than just "its a strong card" because going by that reason we would not have a whole lot of other cards, the reason should be that they are powerful and also in a very dominant deck.
This time they are justifying it by saying the card goes into 100% of pally decks which I really disagree, but also has the flaw that by that readon just rotate the set because many of those cards are used predominantly in many decks.
It has been present in very dominant decks. Aside from that, it's in the classic/evergreen set. They also did not say it's in every deck. Saying it's auto-include doesn't literally mean it's automatically included in every list possible, especially when there are deck building restrictions on some decks.
"We're changing these particular cards because each one has been highly prevalent, regardless of what strategies have been popular or what other cards have existed around them. When Basic and Classic cards become this ubiquitous, they take away some of the flexibility players have when building decks, ultimately stifling the diversity of decks we see when playing Hearthstone.
The following changes are intended to shift these cards from general-purpose "auto-includes" into options that are more likely to be chosen for decks that are focused on strategies that capitalize on what these cards have to offer."
I don't even care what their explanation is TBH, but they're right in saying equality is auto-include status for most lists and that even includes midrange for most metas where midrange was strong. I think equality had it a long time coming, and I say this as someone who has like 2k paladin wins.