Global Illumination alternatives

Cube map are not inherently static , other game engines like unity can render them dynamically in an efficient way , because the rendering is distributed is distributed across several frames and you can even create scripts that makes them to only be rendered again when Unity - Manual: Reflection Probe

Can you further elaborate on this , do you mean that that cube maps have to be carefully placed in lighted areas , in that case , what can be done to improve this system , aside from better dynamic cubemaps , maybe automatic placement of them