As the forum ate the rather lengthy reply of mine, and I don't have the energy to type all that again, here some more findings from my current game in more or less random order:
Xiati Empire
does build Starliners, but has no use for them: On turn 2.6 they're still only at Rock Colonisation 5, putting too many expensive other techs into the research queue; On turn 40, researching Temporal Tech III (400k) while Rock Col 7 isn't even queued)
Cue Cappa does have colonisation tech in turn 40, but only 1 world colonised, 1 coloniser en route to the same system, 1 idle. On that colonised world (large domed), it's building a "Minor Spaceport City" what "only" will take 6.1 years ... instead of a simple Spaceport!
Xi'chung is colonising it's home system, and even builds Starliners - yet 2 of those seem to sit 1 move away from the HW in open space, at least 1 doing nothing... (both didn't have orders, but the minister seemingly moved at least 1)
Ruins: 3 times I "discovered advanced technologie" .. but got nothing .. yeah, I know it's in the readme, but I expected that those "dud" ruins do not generate a missleading message ?!
CSM I : damage resist 30kt // Damage Self-Def Cannons I 25, PD-C 25, Def Can 20; And things are bound to get worse, as CSM II is 80k resarch, PointDefCan II is 160k research ...
Who would design defense cannons which could barely
not detroy incoming missiles?

Hmmm, okay, maybe make that question "Do we want that much realism in SE4?" instead ...
