Yes, I understand this. I posted the same thing upthread:Let's say that the important thing isn't needing to read what's in Ancient Draconic, but actually meeting the sage. Whatever is translated is secondary, if not inconsequential. The sage is going to give the PCs something (info, a quest, a maguffin) that will be important. He is B. All options funnel to B because meeting him closes the scene and opens the next. This is fairly common in adventure paths or modules, which is my preferred play style. What's important here is the obscure language is the hook to find the sage, the not goal in-and-of-itself.
If a PC declares his brother can also translate the language, you lose the hook to the sage and the chain breaks. The language is translated, but that wasn't the point, the point was to meet the sage. Now a new reason to meet the sage much be invented or else the hook becomes dead and a bunch of players sit around going "so what do we do now?"
going back to your sage example - suppose that the adventure outline posits that to get into the cave you need to speak the password in Draconic. And suppose that the adventure posits that you will get that from the sage, who will also warn you that the cave contains a medusa, so you better pack some mirrors! But now a player wants to introduce their cousin the Draconic-speaker, which means the players won't seek out the sage. Why can't the GM just have the sage turn up?
And I'm still not seeing why my suggested solution won't work - if the PCs "need" to meet the sage, in order to get the quest, or the maguffin, or (as in the example I posted) the information about the medusa, why can the GM not just have the sage turn up? You are positing an approach to the player where the GM has a very large degree of control over both backstory and framing. Why can the GM not use that control to frame a scene in which the sage is present with the PCs. I gave a few examples upthread:
if the GM thinks the sage is so important, why not just narrate a scene in which the sage is there? I mean, this could be anything from the sage visiting the PCs' family member for dinner (Gandalf seems to make a habit of that), to meeting the sage on the road, to having the sage take shelter from a storm at the same inn as the PCs, to . . . etc..
This is an example of what I described as blocking the action declaration. I still don't understand what advantage it offers over allowing the player to express their conception of their scholarly Draconic-reading relative, and introducing the sage via the exercise of GM power to frame the scene in question.To stop this, I propose a simple addendum: the brother cannot translate the language himself (it's too obscure), but he knows someone who can (the sage) and thus the chain is unbroken. A new option for the PCs worked on emerged, and it was quickly used instead of the preconceived notions to go to B rather than bypass B and end up in deadspace. I feel that for all but the most stubborn players ("No, my brother is a master of all languages, you're ruining my backstory") this is a fair compromise. PCs create a hereunto thought of solution, the DM moves along to the next check point.
Is the answer that the module only has a description for an encounter with the sage at the latter's distant hermitage, and so putting the sage somewhere else is too great a burden on the GM's capacity to manage the fiction?