I've never seen a "You have resisted 'root spell'' message before. However, it seems very reasonable that root still has a certain percentage chance to land on players. Even if it's something as low as 5% chance or less, people are still going to notice getting rooted.
I really can't comment on what was classic, but being completely immune to spells based on level seems a bit overpowered. I'll leave this up to Nirgon.
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