This has been a game mechanic (& a good one) since 'forever'. Players get exposed to the concept very early on: brain bugs and psychology

It drives players to develop their skill sets and is why many vets carry 2 or 3 sets of gear and swap around depending on the mob type.
Bottom line is that no single solution or approach works 100% of the time - which makes for a much more interesting game.

Ice magic: Preferred skill for pulling (or soloing) in Lab and GK

Fairy Realm: Using a Fire DOT spell as an opener makes things much easier
Winter Nexus: See above

Bard: Removing sonic damage and changing it to nature - try not to use it in FR