Just to clarify. I'm not redoing renders for content that's already in the game. I'm converting and porting all assets from Daz to Blender, which does require redoing all textures, lighting, cameras, etc. The update currently in development will be done entirely in Blender.
I don't think I've hit the limits of Daz in general. There's still a lot I don't know. Thinking ahead for my next game, I want to involve a lot more animations, simulations and vfx. In this aspect, Daz is very limiting and Blender offers much better tools. For example, animating in Daz feels like working in the dark. You can't see how your animation looks in real time, resulting in very clunky and frustrating work.