@Hilde45 got to the Katy Lied master tape fiasco just ahead of me....and back when I read about what happened I was depressed for days, wondering what we had all missed (and the sound of Katy Lied as-issued is great).
IMO, SD faded a little after Katy Lied (not professionally or any of that....just a little bit inspirationally....but, one could argue they had done all there was to do in that particular vein....or maybe "veins" or whatever hastened that somewhat numbed atmosphere that seemed to hover about in their later tunes).
To my huge dismay, Steely Dan's entire recorded output went up in smoke in the disastrous Universal Studios Hollywood warehouse fire in June 2008 (see NYT "The Day the Music Burned").
Along with countless other seminal artists (UNI literally doesn't know the full extent of what was there), we will never hear any unearthed studio gems from any of SD's countless song takes since they literally went up in smoke.