To get to a high enough level to not get two-shotted in the new dungeon.
Leveling up legit is slow, tedious and boring as hell (except for Pit of Heresy, that's still pretty fun.)
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To add on to it, the dungeon is leaving at the end season.
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This! Players want to play the new content, like the Dungeon. It's ridiculous to gate that behind a slow tedious grind that leveling has become. I totally understand why players want to bypass that.