Retcons in media suck, because in order to understand a story in media we need an established bottomline to continue from. If that bottomline keeps changing, everything can change, and that makes a story harder to follow and understand, and that makes it terrible entertainment.
A realistic approach with “perspectives” is absolutely stupid in media, unless it was established from the very beginning, which it was not in Warcraft.
It also fundementally changes many rules set in the world itself, and rules in a world with magic is VERY important.
Writers should try and avoid retcons to the outmost of their ability. Yes, they would have to work within the rules they have already established, but whether that is gonna be good or bad is a testament to the skill of the writer.
In order to understand WoW lore in current day, you will need to pay 1000+ dollar.
And you will need to pay another 1000+ dollar to later understand the retcons that come.
So not only is it bad… it is also very anti-consumerism.