If you don’t balance the game and change things up frequently enough, people get bored and grow tired of their favorite skills/weapons being a big pile of doo doo (Dancing Dagger I’m looking at you.)
If you balance the game too frequently, players get annoyed by the meta constantly changing and them having to rework everything. You also are more unlikely to end up making stupid decisions from not having enough data to see the full effects of your last change.
It’s a delicate balance (within a balance).
So, how often do you think Anet should balance the game?