Well, I didn't sense "over-production" with INTBIL (like one does with "I Just Fall...") - in fact, for the live versions I think the arrangement/orchestration is just about right (it ebbs and flows nicely in density and volume with the movement of the song from verse to chorus) - if the song were placed in it's proper ideal environment as a "showstopper" in a Broadway production it might even be a tad under-produced...speaking of which, can you imagine being in a theater just before intermission and watching Karen move to front center stage with just a single spotlight and sing this like (as you say) she loved it...I would've paid the highest scalper price...Was there "I Need to Be in Love" slander in these parts? CAN'T be! LOL!! INTBIL as a song is gorgeous. Karen loved it and sang it like she did. I think it's over-produced and too elevator but the chord changes, melody, and lyric are fantastic.
And I'm not sure how a song can be "gorgeous" and be one where "the chord changes, melody, and lyric are fantastic" (all spot-on, as the British are so fond of saying) and yet be considered "too elevator"...if so, that's an elevator I want to spend a lot of time riding.