Another note --- One of
@FrogReaver's other objections has been the idea that players can simply handwave/"author" away obstacles as they see fit.
In my experience, this is largely not the case. Once obstacles are introduced into the fiction, the players (through their characters) are obligated to deal with those obstacles through principled play (action declarations and their attendant resolutions).
What this does, however, is place a large burden on the GM
to only introduce obstacles that are relevant, directive, and appropriate to the concerns at hand.
This was one of the points I made earlier regarding
@Lanefan's introduction of the undead death cult on his players. In Dungeon World, obstacles that are not germane to the goals/directives of the players (as expressed through their characters), should only be introduced sparingly, if at all.
If an obstacle is "handwaved"/authored away (or allowed to be by a player), it's because the GM recognizes that the presented obstacle is not germane to the goals of play.