No, it's not quite the same. It would be more like displaying said Van Gogh in a different lighting.
Besides, the same files, having the same DRM, can be crossfaded just fine on macOS, which is also managed by Apple. So even if we assume that some special rights were necessary for this operation, Apple already has them.
Also, the iOS app doesn't even crossfade the MP3 files that you own, and which did not come from Apple Music and have no DRM attached.
So no, I'm not convinced. There's no point in contriving elaborate explanations for what could be easily explained by laziness and indifference to users' wishes, the latter of which has always been a defining characteristic of Apple. Occam's razor.