Comfort, comfort and even more comfort.
If you want to live aboard, then sitting in a comfortable seat is really important. Many a yacht has simple settee seating. Fine for a weekend, week or a month but if it is your home, then having a proper armchair could be a welcome resting place for your tired body.
One (East american?) yacht was built around a man's favourite chair, one that he could relax in, swivelled, tiltted and inclined. Much like a laxyboy chair.
Living on one yacht, we had a full length couch with curved end that could seat 6 to 8 easily. Sailing was often then like