nah I think this is perfectly fine like this. But you are right that if Dread precombat can´t be tanked that Anti fighter Barrage won´t find targets then. Thats a downside and an upside and perfectly fine for me.
 
More interesting is whats techs the Groundforces can take advantage of like; if they die in spce; does gen synthesis/Daxacive animator work on them or not? What about Shocktroopers as some sort of Super-Fighters? I mean Hopes and would be even better then as it already is now! What about the Yin General when it comes to defensive Space Battles?

Removing these as playable races is not a terrible sin, IMHO. However, if you REALLY wanted to have a Necro player, I'm sure you could kitbash some ideas to make it work. Give him individuality, but periodically force him to roll to resist Hive Mind directives, come up with an excuse for how thise one separatd itself from the Hive Mind, etc.
 

IIRC the Jin are Human clones, so I don't see any reason why they'd be incapable of individual thought. Maybe the bulk of their faction is aligned to a single fanatical religious vision, but there's no reason why a player couldn't assume the role of a lone wolf dissenter.
 

I see no reason why any of these races can't be playable. The requirement for an exo-suit is largely fluff when you boil it down. It could be used the odd time as a plot device (oh noes! Your suit is damaged, you need to hurry and patch it.)
Giving them the option for "combat-hardened" suits that can withstand moderate weapons fire largely resolves issues of them wearing these things into battle.
And yes, the Muaat do require exo-suits.
 

Indeed. As such, "Mentak" would be a political affiliation that a character of ANY race could claim, if they so desired.
Of all the races, Mentak would be the easiest to integrate into a rag-tag team of adventurers, I would think.
 
I understand exactly what you mean by this, and if it seems hard to believe that's because it is.  The establishment of a global political body would be a veritable necessity when dealing with alien species, but that wouldn't absolve us of our own nationalities and other political affiliations.  It wouldn't make our entire species one unified organization.
 
However, as Fnoffen pointed out, this isn't really a flaw with TI's setting so much as it is a flaw with sci-fi in general.  But of course, the generalizations go far beyond just grouping an entire race under one banner.  For instance, the majority of sci fi settings (Mass Effect, Star Trek, Twilight Imperium, etc) depict most aliens as basically humanoid and breathing the same air.  Species that require exo-suits are rare.  In reality, this would be statistically impossible.  We humans are known to get sick just from drinking water in a different country because the native bacteria are too different from what we're used to.  Forget about drinking water from another planet.  The odds that we'd be able to breathe the air on another planet without mechanical assistance are already miniscule, even if it had an atmosphere.  So multiple alien species from different corners of the galaxy being able to breathe the same air?  Forget about it.  I know some people who disliked War of the Worlds for having an anticlimactic ending, and while I can see what they mean by that, the fact is it was one of the most realistic alien invasion stories I've ever read precisely because of how it ended.
 
There are a LOT of these sorts of technicalities that sci fi glosses over in the interest of telling a good story, not the least of which is the mind-bogglignly large amount of emtpy space between planets and stars, and the amount of time it'd take to travel anywhere, even at relatavisitic speeds.  You would need to draw the line somewhere yourself, in such an RPG, otherwise the entire game would consist of your players sitting in their own habitable environments, talking to each other on video screens.  In a REALLY realistic game, they'd probably spend more time troubleshooting communication glitches between two completely alien computer systems just to TALK to one another than they'd spend doing anything actually interesting.  (Even saying THAT much is assuming we hand-wave the technicalities of translating languages you can't physically speak.  Either you have a techno-magic computer that always perfectly translates every language in existence, or your player character is a genius who can comprehend and mentally track a single conversation being conducted across 6 or 7 different languages.)
 
This is why suspension of disbelief, on the part of the audience, is such an important part of any story.  If you refuse to just accept at least a few obviously ridiculous things, you'll never get the story off the ground.