One thing which I think is missing in many of these discussions is the possibility of solo hiking with a partner. By that I mean that you meet at night to sleep together and perhaps at other predetermined spots but each person hikes separately during the day. Many folks enjoy company in the evening but prefer to hike alone during the day.It still takes some comprises but adds a level of comfort to the experience. Obviously this will vary with the area and the companion but it certainly is worth investigation.