I don't know about you, but I'd still rather update via CIAs then run something to execute the AM:InstallFirm. The only time it failed me was when I forgot to reinstall it correctly after testing something in 4.5 CFW. So after updating with CIAs, I go to launch it and it got stuck at boot logo. Lol. But that's what my NAND mod was for.
Maybe things are bit more dicey on the n3DS hence the server spoofing stuff. I don't really have a n3DS to test updating with. Perhaps updating a n3DS via CIAs is not as simple as doing an old 3DS. My old 3ds was easy as pie. I just had to leave out all the n3DS stuff. I already have it updated now, so this newly discovered update method doesn't mean much to me now.