This. Thankfully I have managed to finish my AF quests but I feel so sorry for the people who shout in Uldah for help with AF quest 1/8. Most people have already done the fights that require a party a number of times for themselves and friends and are just tired of them. For the main quest that would be even more the case so that new players starting the game would struggle mightily with finishing the content. Content finder might help but doing content with random strangers is not automatically better than doing it solo in my humble opinion. Having some rare drops from these quests could incentivies experienced LS members to help out new people.
The problem with the main quest isn't that it is solo, it's that it is poorly executed. I would have liked to see it tie together the team around you more closely where you would fight together with a good path companion that actually continues to play a role outside the main scenario, your chocobo and maybe even your retainers in some support role so that you bond with the NPC characters attached to you.