If you can only interact with the AI, complex diplomatic models do not mean much. It all boils down to "do we like you or not". SE4 actually has a complex diplomatic model; the AI just does not work with half of it.
So basically, GalCiv has a lot of needlessly complex information and models. There is often beauty in simplicity. From what you have said, it sounds like GalCiv will be a micromanagment hell.
That level of detail for each and every planet looks like too much for a 4X game. You are not developing a planet, but an inter-galactic empire. The focus should not be on planetary infrastructure and the socio-economic forces of each planet, but more on a galactic scale.
SE4 could use a little more complexity in planetary infrastructure and such, but not too much.