Class Development

[MajinDragon]

Well first and foremost you need to make the existing stats balanced so that there's a reason to opt for favoring Int/Wis/Pow/Cha early game as well as provide crucial late game rewards specific to those classes.

Str Dex and Con all have very important rewards that scale well in any stage of the game. Str translates to damage output and carry weight which supports Dex's attack speed and movement speed bonuses and Con is just overall useful. But in the early stages of the game these appear to be the only important stats because speed is often such a deterrent early game if you're running at ~1.0.

Int, Pow, Wis and Cha don't offer much of anything early game because a players speed will make any grind as a pure mage into an impossible quest.

A simple late game suggestion would be to increase the caps on certain stats depending on classes. This wouldn't have any affect in early-mid game so however you differentiate there will probably still scale over and stack with this. For example, A warrior's Str and Con caps would move to 35Str 35Con, with Dex, Int etc.. remaining at the 30 cap, or even reduced caps are possible. Another example, Thief's would have Dex and Cha cap at 35. But this can only work if stats are balanced otherwise people will rush toward whatever makes them the best sword swinger like always.