@Lenglon: It's more than them being defensive stats. Sure, Fate and End are useful, but Mind and Dex have extra usefulness on top of them being defensive stats. Dex also controls initiative and melee\thrown weapons that are not Uncon, plus it gives you a chance to not get hurt at all, Mind provides mind points for space magic users and allows people to roll to think and get info.
End on the other hand many times only mitigates the damage but does not stop you from getting hurt and becomes less relevant with armour (although a +2/+3 means that your chances of ending up permadead if hurt are extremely low and <0 means that even when armoured there's probably a chance of being harmed). End is also useful for environmental hazards like poision and radiation, but those don't come up very often. And Fate and Intuition only come up in specific circumstances (although intuition makes up for it by being able to provide info).
@RC: Sure, I understand, no need to do extra work if it's not going to help much.
And the Exo usefulness is sort of mitigated by it taking up a brain slot and the fact that you need to buy an extra piece of equipment and use compatible hardware for it to work. If it costs somewhere around 5-10 tokens and has something like a +1Aux +2Exo requirement or something similar it should be OK.
Unless I am misunderstanding what that thing is supposed to be
EDIT: @kj: Well, if you don't mind a high chance of being dead almost every mission, having high endurance could work, since unless you are hit by something really bad like a nuke or a manipulator overload, you'll survive with a good end roll. Put some points in Fate and buy some decent armour and you can tank everything, although you'd still probably end up dead. But hey, if the aliens are killing you, they're probably not killing someone else. Not everyone has to kill stuff to help complete the objective.
EDIT EDIT: Oh, and if you get some sort of Aux vehichle and put some points in that, you can use aux instead of dex while escaping. Maybe you can even get a literal tank/drone platform. Imagine some sort of flying armoured thing at the centre of a drone swarm. Could work. I'll keep it in my "ideas for next character" notepad. You start as that techie that always gets hurt but somehow always survives and end up as an Aux-based nigh-invincible techno-god-of-war, killing everything with his minions.