Turn-Based RPGs With Virtually Perfect Class Systems

You cannot have an RPG without some form of progression, and classes tend to be the most popular method. Not every game needs to go down this route, but many turn-based RPGs implement traditional or experimental class systems to brilliant effect; crucially, the best ones know how to avoid obvious traps and early-game broken builds, all the while prioritizing class synergy between characters and rewarding optimization over endlessly grinding for stats.