"Enough SP" is subjective and depends on the density of content within all level ranges. We will only know whether they allow us to gain enough SP when masses start coming in, probably this year.

XIV is still a group-based game, which is why there is a restriction. It is restrictive by the very nature of the style of activity. If you were supposed to solo, there would be no restrictions. Since you are supposed to group, needing a group is the restriction.