So I tried another enigmatic observer run, where my little band of people kept to their one solar system and with some modding, colonized it to its fullest extent. Besides defending the system from hostile encroachers, there is something quite charming about personalizing and characterizing each planet - the Command planet, the great Fortress of Terra, control centre of the sol system. Mars, the technocratic centre of learning and investigation. Venus the power plant of the galaxy, twinned with the industrious Mercury. All that leaves is the little Lunar moon, boasting officer training centres, virtual reality arenas and a secret cloning facility from which to raise the clone legions. The clone soldiers with all bonuses stacked boast 28% more damage, 39% more morale damage and have 9% more health and morale than regular baseline assault troops, all for the same price and maintenance - not factoring in how addons affect them. Pretty nice. But that's after dedicating a planet and a tile to their construction, and they don't stand up on a quality basis to the destructive capability of Xenomorphs, the emotionless warfare of the Synths, the mind warfare of the Psi Warriors or the superiority of Gene Marines. The great advantage clone armies have is that not only are they better than assault troops for the same cost, they are manufactured far faster than any other soldier is trained.
Gene Warriors, Xenomorphs and Psi Warriors all take 360 days to manufacture, Synth Armies 120 days and Assault Troops 60 days. Clone armies take 30 days to manufacture. The issue lies though in how meaningless production time is for armies.
For starters it only affects buildup of armies, and once you have 10 armies you are set forever (only needing to build more armies for sectors out of transport warp reach - and only if you don't have transports designable). Attrition is meaningless, attacking units very rarely die in planetary invasions since planetary invasions are afterthoughts - the cleanup of what the space crew has already done.
It would be nice for example to have transport ships (or at the very least attached soldiers) to be able to conduct boarding actions of enemy ships, or a planetary invasion system that isn't so unsatisfying and unbalanced. As it stands once one has gained void supremacy, there is nothing the defending planet can do to stop defeat. It would be neat for example if you had to take every tile on the planet tile by tile, so an ocean based species would find fighting a conventional war against a desert based guerilla exceedingly difficult without resorting to militiarist tactics (like full orbital bombardment). And why are all tiles the same climate sphere for that matter on all the planets? It is sad that you can't have a tundra species living on your ice caps, a jungle species in your jungle, desert species on your equator and temperate species in the upper and lower bands all living on one planet.
I also like the idea of tile by tile invasion, because then attrition means something and if the defender can hold onto their production cities and such, then they can still wage war from the ground up (as well as actually making planetary shields worth something). Starvation would actually have to be implemented too, for real, but the infamy system is broken so PI have decided it's more realistic that you can't starve your enemy into surrendering or starve your own people through incompetence/malignancy ~o.o~
Plus - how amazing would it be for stuff like the special units having special interactions with the tiles be? So Xenomorphs conduct wanton devastation and kill all resistance with great efficiency, but if you don't have a kill switch for them, may end up infesting certain tiles (tile blocker?). Or psi warriors being able to take tiles without collateral damage due to their unique form of precision warfare?
And good god - how come the cloning vats don't let you clone pops?
I will say this though, if you keep things small and limited to as few systems as possible, things are pretty neat. It seems the later game, large empire crunch is a little bit more unfinished