I go back and forth on this one. On one hand, it does not really add anything and for a long time I did not really use it. There isn't much point without an appearance system (or a more crucial one). ...
I love clutter. My preferred method of 'playing' is mostly building and set dressing rooms and landscaping is my favourite part. I dont like a clutter free build as it looks like a show home (and yet ironically Im a minimalist at home!). Gotta have MOO though. Not necessarily because I overload builds with clutter its just placing everything in set squares looks weirdly uniform and you wouldnt see that generally in a home.