Please correct me if I'm wrong, but can you not only have 16 completed levequests stored in your log? I don't think that would be enough to hit 70 or even give a significant advantage. It's only 3 days worth of allowances. Early access will give a much bigger advantage than that.

Beastman quests will probably not contribute above level 60. At least for Moogles since the experience reward plummets down to 10k if you swap to a level 60 crafter. I recall the same thing happens with Ixal turn-ins and quests. Hopefully collectibles are the same since they are only limited by your inventory space and thus would give an advantage to those who spend real money on retainers.

As for battle content I hope they don't nerf PotD, dungeons and fates like last time, but rather naturally scale the new content so that it's worth doing over the old.