AbdulAlhazred
Legend
Well...Except we are talking about different areas of the gaming community. There is an OSR and sandbox community. And yes that varies. But I think you can speak generally. Normally I would be only focused on my own style. But when you have a whole thread of posters attacking you because you think a GM deciding the brother is dead would be okay in a sandbox, it is relevant to share your view on what the norm among sandbox players seems to be. Now I could be wrong about that norm. It is always possible to be wrong. But I don't think I am, and I think at the very least, this is a style you see frequently among sandbox players, if not most of the time. That doesn't make it more right as a sandbox. But it does mean, people familiar with sandbox wouldn't be as shocked or surprised by my assertion as the posters here are (and again, I think that is relevant).
My answer is, I don't think even YOU actually believe it would be the norm, if you think about it objectively for a few minutes.
What I'm saying is, you probably wouldn't declare the brother pointlessly dead. I think you demonstrate a very significant amount of experience and understanding of how people want games to play out, and if this was literally happening on your table, you would be very unlikely to just present the situation as a dead end like this. I think you'd come up with something, just like you'd probably come up with something if the PCs decided to just head west off the edge of your sandbox map, right? It is really basically the same sort of thing, you would not (most likely) erect a 10 mile high wooden barrier at the west edge of your map!
So is it really the norm for anyone to play that way? (well, sure, it is probably for someone somewhere, but IMHO they have a short career as a GM ahead of them).