We already have that: You can ditch your soul crystal in favor of more cross class skills.
Why don't you do it? Note: That's a rhetorical question. We all know it's because it's less efficient than going with your soul crystal.
Customization of stats and gameplay doesn't work out too well in MMOs, because people enforce optimization. You "can" customize your playstyle quite a bit, you can cross-class melee skills as ACN, equip STR accessories and melded gear and pummel people to death with your book. And chances are, people won't even care as long as you do that alone. As soon as you step into group content like that however...oh boy.
This is the core issue of customization in team based online games. The best you can do is to make the whole stat system so extremely convoluted, confusing, unclear and complex that even the smartest math-whiz just cannot possibly comprehend which choices are good and which are bad, so they can't judge others over it. Either that, or perfectly balance all the choices you can make. Good luck with that.
		
		

			
			
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