Right on. I appreciate it.
It's not mind control. If a character is persuaded, that doesn't mean that the character changes their mind necessarily. It just means that they've agreed to go along with whatever's being proposed or their arguments against doing so have not won the day. The player can
of course decide their little dude has been persuaded, but it's not mandatory. I'm wary of using examples from fiction too much, as I don't think they're as useful as they seem to be, but when the Fellowship of the Ring decides to go over the Redhorn Pass instead of through Moria, Gimli's not of a different mind than he was before they started up the mountains -- he would still prefer to go through the Mines, but he's lost the argument, so up he goes with the rest.
Ob(stacle)s are set in the same way as DCs more or less. The general table is as follows:
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They do do the Duel of Wits in post #5 in that thread, and, what Si Juk says does make a difference, both in terms of setting the stakes and the fiction (I'm sure that in play there was more, but I've bolded a few places where they do say things -- in the end, the dice will determine how much these statements matter, but all this is going to push into the framing for the new situation, which I've bolded at the end):