The way I see it : we get a powerful Bahamut every 2 minutes, but we pay a price for it in terms of personal power. Problems I can see with it :
- Death will be even more of a punishment for us than other classes.
- We get the Bahamut only at 70, but the fee is payed way before and all up to it.

I think it will be really balanced at 70 and adapted with the new stuff. With the dmg / potency increasing, they had to nerf potencies.

BUT if we have to go back (and we will have to because of memoquartz, to stuff rerolls, farm relic, etc…) we’ll juste be in there basically 20-30% less efficient than now. So it’s EXACTLY like heavensward :
• HS : oh god now that I’ve reached 60’s gameplay, I don’t even want to play a thing not 60 with SMN anymore, not ever !
• SB : will be exactly the same but with 70.

I’m kinda getting bored with that (a “don’t go back or feel the pain” class). But I’m really optimistic for 70 content.