@the-sands
That's false equivalency. But, sure, if you're in the right area with the right equipment, and the situation could dictate it, you can restart their heart, though perhaps the rules say they're braindead now but they're ALIVE, or they're horribly disfigured and scarred or they are paralyzed from the neck down. And yes, I'm being explicitly facetious in my response there, but it answers your exact question.
Regarding skills having limits, I don't think anyone here has said they don't. What we're stating for discussion is that social skills should have something behind them if they are an explicit part of the system. I think most of us have consistently put forth the conceit that 'No, social stats cannot make you do certain things' and have posited tons of things (typefuck being the primary culprit, because all the time THIS DISCUSSION comes up because of the community's fucking skeezy behavior).
I can think of tons of instances where people are manipulated in media without social powers. And your example is EXPLICIT in stating 'limited margins' such as intimidation, which is what most of us HAVE BEEN SAYING this whole time.
But any system requires buy in. Well, I guess looking at the examples and reasoning presented in the many times this thread has been repeated, except physical conflict. But that's because we are TRAINED that Physical Conflict should have a system behind it.
And sometimes, I'm sorry, but sometimes losing player agency because of the system has to happen. It's Bad Metagaming to not adhere to things that are implicit in the system.
If I blow out your kneecaps with called shots that are recorded by the system and you have Conditions or whatever from those, that should be no different than me making a successful Lies roll to get you to speak out of turn and reveal some type of information.
Also, I don't think anyone has said anything about 'deeply held beliefs'. In fact, those of us who have posited social resolution systems here have stated that there should implicitly be things that Social Conflict can NOT do/change. Typefuck, change your sexual orientation, make people fall in love, the list goes on. But there are some things that it should, both in the short term (telling a convincing lie and getting information; torture and intimidation vis a vis leverage to get BIG secrets).
@Roz
In my ideas for a social system, a shit approach wouldn't even start a Social Conflict. But again, all of this requires player buy in and willingness to understand that, sometimes for the story (and remember, we're here in a 'text based medium to play story games, not wank an e-peen character sheet' right? Yes, I'm being deliberately facetious again) your agency will be lost. Roll with it as much as your agency to go out and RP is lost if your kneecaps are blown out and you have a system-dictated 2 weeks of hospital recovery time.