You do realize that before ARR, there was also an entire story in 1.0, too?
I don't see how isolating Stormblood's story the same way they did ARR's story would create issues.
I didn't play in 1.0. I didn't go through the calamity. I'm sure there are a lot of references and additional character depth (like the entire thing between Thancred and Minfilia) that I won't understand. That doesn't stop me at all from enjoying ARR and HW.