The reason anyone can do it just fine with mages is because the game itself isn't difficult as long as you have the right gears and run on the right tracks. This is caused by the fact that 95% (or somewhere around that) of the encounter in the game can be beaten through sheer power.

That's why Mages, even in their current stat, can perform as long as you stack a bunch of stuffs that deal tons of damage that instantly kill the target in a single round of action or at least leave a bunch half dead and disabled for the next person to clean.

With how mages are played, they might actually be considered the more "balance" choice atm. The problem is that the average power level of physical builds is higher than even the power of the best mage builds, making them seem weak. No matter how well they perform, mages will always feel like a weaker ranger atm since they can bounce attack with ricochet, deal as much or more damage with highground crit with any CC and element as long as they have the arrows along with the best AoE in the game while also having a mobility skill. If it wasn't for the game lack of high level crossbow, offensive mages would never be able to catch up at level 20.