No. This is the reason you can skip the last part of the campaign and go to monos around level 50 (monos are level 58 if i remember correctly). Also mission after the tundra boss don't give idols slot and passive points
Actually there is. While in a zone more than 5 levels above your own, you gain xp as though you were in a zone 5 levels above you. So if you are level 40 in a level 50 zone, you gain xp as though it was a level 45 zone.