I did doubt their sanity a bit, but mostly I shrugged my shoulders. While I think they went somewhat overboard in that instance, it didn't physically hurt my eyes to use the app. The reel-to-reel tape animation was even sort of endearing, but ultimately the performance of the app suffered, which was my major complaint about it.
I suppose Apple could make everything light gray on top of dark gray but that would get a bit boring. I'll reserve judgement until/if this app gets released.