That STILL assumes that the GM will go along! In, say, Dungeon World, that's not an assumption we have to make! If I'm GMing it correctly, and Pemerton's Dark Elf character wants to search Evard's Tower for spell books to help his assistant, then its really not the GM's place to put something else in the way. I mean, GM fiction can't just say "there is no such tower", the GM should establish its existence. Say if the character Spouts Lore about the location of this tower, after establishing a genuine reason to want to find it, then the lore probably shouldn't be "its on the far side of the continent and rumored to be impossible to reach" unless everyone has concluded that the intent is to run a campaign long story arc! In DW the logical option is for the GM to ask the character where he thinks the tower is likely to be, or something about Evard, etc. I'm skeptical that most trad GMs are doing this kind of thing as a rule, though I wouldn't want to assume this is true of any specific poster here. Maybe some are!