I have since discovered that Astral Finishes/Losses are necessary for full route completion on a few characters in Story mode.
Ragna’s bad end requires a loss to Rachel, as does Jin’s (though I think any loss may be acceptable in his case) and his gag reel requires at least one prior playthrough. Tsubaki’s gag reel needs a loss to Jin, and her BAD END requires you to use Astral Finishes (I Astraled Carl, Jin and Noel to get this)
Took on Hazama with Tager after I cleared arcade mode with Noel. Hazama was no match for the ingenuity of Russian Science (ie, backstep, 360 dpad B) and also had an “easy” time with Lambda… if you count spamming D swords and running away like a little girl an easy time of it. I’ve just about given up on trying to clear Carl in the arcade mode, as I’m horri-bad with him and basically rely on Nirvana for…well, everything. He’s too squishy as well…and his 10 second countdown on his Astral isn’t doing me any favors when Hazama can just leap over it, beat the crap out of me, and laugh when the explosion finally goes off.