All I am saying is that a runner needs social skills, they don't have to be very high. An uncouth character with no social skills with piss off a great many people. He may never know why he does it. Taking uncouth as a role-playing aspect is cool with me. Taking it as a way to get free BP with no down side, I am not ok with. I go out of my way to have characters with some social skill, 5 or 6 dice is pretty inexpensive. a Socially inept character can be a shadowrunner, but the player needs to figure out how the runner handles that in regards to his contacts. Neg qualities should never be just free BP, they are ment to be role-play aspects of the character.
Well, I do like a bit of social skills, but I wouldn't say they're mandatory. Someone with no social skills won't be able to do certain things, but that's part of why they have team mates. There is a difference between being bad at something and being unaware of it.
So, without Charisma and Social skills, a character isn't going to:
1) Con - Lie convincingly or tell when they're being lied to. (Judge Intentions tests could let them know if a person is hostile or over-eager, just not why.)
2) Etiquette - Convince people to like them better or not be drawn in by someone else's likability.
3) Intimidation - Scare people into being nicer to them, though, with Willpower opposed, they might still be able to stand up to a threat, but, otherwise, deference is the order of the day.
4) Leadership - Convince people to follow their orders or advice, though, again, Willpower can still keep them from being a toady.
5) Negotiation - Argue for a better position on something or keep an advantage which they can't justify.
Those are the weapons of the Social character. They're powerful, but so is an Ares Alpha. Not everyone needs to tote an Ares Alpha.
For the Uncouth though, it's a real problem because they're so clueless that they don't know how bad they are at these things. Then you get the
Dunning–Kruger effect, where their complete lack of ability doesn't afford them the perspective to see just how terrible they are at it.
As a counter example, a hacker I'm playing in the Road to Redmond PbP game has a Charisma of 2 and no social skills but is well aware of his effects on others (dp of 10 for judge intentions,) and is no pushover (Willpower of 6.) He has a tendency to like and trust charismatic people so long as they're acing reasonable, and he'll do things like tell them a lot more than he should and defer to their judgment on what's fair. He doesn't lie, except by staying quiet about something. He doesn't try to bargain, because he trusts reasonable people to work something out... or to be unreasonable and get their ass shot. He's very logical (effective logic of 11,) but takes it in stride when people disregard his logic. He doesn't bother with threats, because, as a Gnome, he's used to being dismissed. He knows better than to try to win people's confidence, so, being a clever bastard, when he talks to someone (and he talks a lot) he antagonizes them in such a was as to draw responses out of them.