As others have already stated, I don't see why forcing all empires in the game to adopt a realistic Earth approach to it's government (in regards to the inability to directly and 100% control it's members - not to mention it's not even realistic for all countries on Earth!) helps with immersion. If anything, it completely and utterly destroys it for me. Why would the Drengin have a senate and not be able to war without said senate approval? Why would the Yor *SINGULARITY*, an AI collective, be unable to switch it's focus 100% at will - they are physical platforms running advanced AI, not organic beings with a mind containing years of dedicated training in one field.
It makes picking a race depend only on what their traits are and what victory condition I feel like going for in that game and eliminates all pretence of role-playing. If you are going to introduce this "senate" type thing then it should apply only to those it makes sense to apply too - the Terran's. Then each race would need it's own form of government for immersion purposes, much like Crusader Kings 2 has - feudalism, republic, pagan, tribal, muslim etc.
If you read the stuff the yor say about themselves & others, that's not entirely accurate (or inaccurate)
* individual Yor absolutely are individuals who "get bored", become "unhappy", or directly execute happiness in their AI matrix (wording probably off on that last one).
* while it's anybody's guess what sorts of diversions Yor enjoy, the fact that meat species enjoy them through tourism as explicitly stated in research too suggests that they can't be
*too* far into the starfish aliens axis they live on http://tvtropes.org/pmwiki/pmwiki.php/Main/StarfishAliens) even if they have a number of traits that unquestionsbly put them at least partly across that realm's border.
** a big part of why they have at least one foot on the mearly rubber forehead side of the starfish aliens borderis obviously a result of a lack of context to compare themselves to leaving them still figuring out the whole machine consciousness/artificial sentience thing.. on that note, they or are conscious and sentient rather than simply -existing at the lower "intelligent" bar, what team do they prefer & what kinds of philosophical debates do they have ?
* it may r may not be easy for an individual Yor to reskill as we would, but we do know that the reeesrch, manufacturing, interstellar navy , etc Yor all explicitly have things pointed out about optimizations and the addition / alteration of limbs/sensors to brtter specialize in their roles.. depending on the extent of the physical alterations , this it be far from trivial & I'd guess probably would shiftforever upward in efficiencies there, but run into a point pretty quickly where the gains are almost immeasurably small...of coursr, if they are at the point of a technological singularity all bets are off.
One of the biggest differences between yor& non synthetic logic Imo is that while the Yor talk about the extinction of biological races with the misunderstanding of itoften viewed as as a threat akin to the Drengin 2orld about eating and in slaving them... while the Yor simply state it as a fact since they are able to plan on geological timescales and expect (rather than just hope/imagine ) to still be around then while their biological counterparts expect/hope some distant offspring will be around then. From the Yor PoV, add enough distance and the original species will eventually be extinct through simple genetic drift and speciation