I personally didnt really have an issue with this fight so i'd be happy leaving as is.
I think reducing the effective spells to mezz only really removes a lot of classes who can help with this fight, and make the fight far more frustrating as mentioned previously (where the classes i can use drops from something like 6+ to like 2... but because the resistances are still high, it'll take 3x longer to land a spell causing the fight to take faaaaar longer and make it far more difficult as things beef up as it says on the wiki guide).
Having said that, I wont be doing this event again, so it makes no diff to me
