A lot of the story fights in Stormblood have more teeth in them then the fights you experience today in ARR and HW. But none of them are really unfair and there is always The Echo to help you out. Finished the fight at the first attempt, although the meteor phase was a bit tight, the Y'Shtola fight is easy and fun, you just need to ignore Hiens pleas to leave him alone and just nuke the add while dodging Magnais attacks.