strongly disagree. many exploits possible, like crafting from the other side of impregnable walls with enemies around.
otoh, we could use pathfinding to access an area of around 10 tiles worth of walking when crafting, provided that if he does access any item outside LOS, the char will automatically move until he can grab said item, then return to the start point. (ensuring that everyone with LOS to the tile where the item is will see the character)