Doug Oade is a very big proponent of running XY. While that config may be great with other mics it certainly is not a good choice with the 480's.
I think that as a blanket statement, that is pretty bunk.
I can show you TONS of excellent AKG XY recordings. I've made lots of them myself, plus there are many , many others out there.
I dont think i've ever heard any mic that sucks XY.
see my Lowell Ratdog 8-12 on LMA for reference.
I"ve also got some great Panic from recent, done XY. Allman Brothers...and i'm sure there is more.
While not intending that EVERY xy tape sucks with the AKG's you must have completely the opposite experiences running that config than I do. Too many tapes where i've stuck with xy turned out so thin and really unlistenable to me that I can't imagine running that config again with those mics. Now I have good experiences running XY with my current and former Neumanns as well as some MBHO's that I ran but not the AKG's.
Funny how something can work so well for some and not so well at all for others. Such is life I guess.