We'll thank the Windermerean engineering borrowed for the AX then, I guess? /s
Though the Sv 262 did always give me Syd Mead vibes not sure I could risk having the DX release, maybe the Mirage kit though.
I've actually seen a few Japanese toy reviewers discuss this as making a bit but not a total difference with the guns but maybe they didn't fully commit to the slide as you said. Did this help with the arm gap near the inner wing edge at all? That's honestly my biggest gripe visually (and structurally) with this release. I like the chonkier arms for battroid mode a lot but I hate how they mess with the fighter mode.