I am fine with the new classes starting at level 60, I reckon some players want to do Shadowbringers content asap as one of the new classes, instead of being forced to start at low level, we only need to level 10 levels to reach Stormblood max level.

Still, I can see new tanks and healers causing issues... maybe lock the class behind a requirement? Instead of only having a level 60 class , the player is required to have a level 60 tank or healer... but this too would be a obstacle from dps only players who want to try the new classes.