The bigger tragedy (for me, at least) is that Columbia strangely never released a quad mix of 1975's Man-Child, which came in between Thrust and Secrets. Not only is it some of his best fusion material, it's also really sonically dense, with even more keyboard layering than his previous albums, and it also has a horn section on some tracks. The album also has former Motown session man Wah Wah Watson (he of Papa Was a Rolling Stone fame) all over it, both as a writer and also playing his guitar through a variety of effects incluing (obviously) wah wah, echoplex, and talk box. Oh and Stevie Wonder drops by to blow a crazy harmonica solo on one of the tracks.
Honestly can't figure out why this never got the quad treatment - if Herbie was going to dip into his back catalog for an Atmos remix, this is the one I'd start with.