It makes the early game tight on food, admittedly, but it gives you the chance to set up an efficient mob trap to go with your defenses. In my current game (the inauspiciously named "Attempt 13"), I was able to set up water streams in a moat to push all the mobs that attack my base into a drowning trap. I have more bones and arrows than I need, and it also provides a surprisingly large amount of fish (though that will go away with the removal of fishing zombies).Avoiding all mobs on this pack would be problematic, they are an important early resource, and you need the cooler work time in the evening. I for one would call beds a very two edged sword.
ETA: Which would have been difficult to impossible with special mobs, as sizable proportion of zombies and skeletons survive right through the day.