Hi everyone.
I've been a lurker of this thread for a while, and even if I'm not really sure about what has made me de-lurk (I'm pretty sure the page count has something to do with it) there's something about Tali and quarians in general I'd like to discuss with you all.
First (I somehow feel the moral obligation to post this "disclaimer"), I'm pretty sure you've discussed this before, but I just can't remember what were the thoughts about it! (I know I could have used the search -heck, I could even have googled it!-, but it's not as fun as reading the discussion on live!).
There's something that bothers me about the quarian immune system.
What is so wrong about it that it can't be fixed? As soon as I start to think about it, the example of human AIDS comes to my mind. I'm aware it's not the same origin, but it leads to a similar situation, the lack of immune cells and therefore lack of immune strength.
People who's got AIDS, and doctors who attempt to cure it, know where do they have to aim to reach for a possible cure.
There are also plenty of autoimmune diseases that we've been able to discover and treat.
We humans are definitely NOT considered as the most medically advanced species of the ME'verse, yet we have been able to discover what was wrong within the immune system of these certain individuals and fix it (with more or less success), and all we had to do was to test and try.
It looks to me like all that quarians have done is isolate themselves, rather than actually seeking a cure for whatever they had. Like it happens when certain addicts are blamed, they claim to "be like this", I've got the impression that quarians might be somewhat proud of "being like this".
I might understand why other species hadn't helped them, like the Hanar are helping the Drell, due to a certain resentment because of the Geth. I wouldn't personally approve it, but that's a whole different matter (based in pure speculation).
So... Well. To sum up, my points are:
Even within the lack of knowledge we've got of quarian (and turian

) physiology, what is really wrong about their immune systems? Are they lacking a concrete antibody?
This leads me to my second point, if they know what's wrong with them, why don't they try to fix it, or get someone to fix it for them? (I'm pretty sure Shepard would mobilize the whole mankind to get a cure for Tali). If they lack something or have it in a really low concentration, why don't they replicate it and have it as a medicine?
And finally, in case they didn't know what was really wrong (which I doubt, because this would be a really really good thing to discover, and if they hadn't the right specialist, I'm pretty sure that knowledge related to it would be a very valuable "gift" to bring from a Pilgrimage), why haven't they done anything about it?
And that's pretty much it
Of course, I'm aware the suits are cool and a great addition when it comes to giving personality and distinction to a race, but... You know.