Do you mean a mode where you do everything by yourself, even dungeons? While I get that cutscenes puts our player solely in the role of the WOL, they still make 'references' to our friends in the party who help us. Plus doing group content solo defeats the purpose of it being 'group content'. If you're worried about others being mad at you or rushing you, take friends with you. That's what I did for some of the other content. Also MSQ instances aren't hard, they actually sort of practice mode areas that teach you how to do dungeon/raid mechanics.