The mechanic in that fight was not intuitive ie. most players did not understand it nor do it.

I did the dungeon many times and usually saw people take extreme damage from it because of the damage being reflected to them. The healer would have a lot of work and there would even be wipes from it.

I don't think it should have changed because it was an interesting fight, but changing it is in line with the current direction of making dungeon fights intuitive (aka obvious).