Yeah, ok, the party I joined we 1-shot it as a fresh prog. The reclear was a 1-shot as well, even with deaths and damage downs.

If you're not confident in the mechanics, go into the Stormblood version of it unsynced on your own and practice the mechanics.

If you're confident in the mechanics and they aren't getting anywhere, you can tell them you need to feed your goldfish, leave the party and try a different one.