From Reddit: NO level sync when entering a dungeon with less that required players!

[XiXiQ]

If they allowed solo, the 'MMO' goes *poof* and all you have left is a sword shooter.

If they were carte blanche about it, yes, but they seem to be only opening it for certain older dungeons. It's not like there won't be plenty of dungeons that require full groups, or would be impossible to solo given the mechanics anyway.

for those on quieter server times, and dps who spend so much time waiting on queues, this could be a shot in the arm. Time will tell.