..compared to Yogg Saron no keepers.
This is because 4th phase of Ragnaros reminded me of Algalon. It's not the same mechanics but it was the same complexity. Raid had to do lots of stuff, boss was moving, but in overall it was a "heroic fight into a heroic fight" in Ragnaros. Algalon was its own fight.
So, doing Yogg Saron no keepers was such an achievement and Ensidia saying "Only Algalon matters" was such a hack.