Not enough for what? Solutions of problems you described so lies on surface that I don’t even want to write all this for the tenth time
Besides if they have that (spoiler), if they assume that players can play however they want (make up any fancy restrictions in their head), then why can't they let us setting the game however we want at our own risk. Why can we choose 25% loot and 25% experience, super many zombies, we can even increase AI block damage, but why we cannot limit the number of available quests on the map? Exactly the same challenge. Objections that it will be boring or too hard apply exactly the same to the above settings. Why is it there then?