IMHO variety in builds is good, it gives options to fight differently and not every character is a "hybrid clone" with same stats and equipment as a melee class.

DEX Guardians
STR Defenders
VIT dekans
INT dekans
AGI dhans
...

OP classes and builds only become a problem when you enable them to "buy" ridicules equipment and boosts. All is about balance and some changes to make different classes viable with alternative stat/skill builds would only be positive.