You want THE most in-depth, customizable 4X space game on the planet. Here it is. But can you help develop the AI?
The main problem is that early releases of SE:V had many bugs because of the enormously complex interactions that program would undertake in processing turns. The good news is that most, if not all of the major and minor bugs have been squashed. The only remaining concern is that the Stock AI is not particularly challenging, though there are several freely available (and easily accessible) mods that make significant improvements. Still for veteran SE players a little more work on the AI would be appreciated -- and fortunately is being done.