[CamperBob2]

It's like playing a familiar song on an old cassette tape on a modern system. The user will likely be tempted to crank up the treble, trying to recover content that isn't there. In the image-scaling example, the HF content wasn't there to begin with -- since you upsampled it, it couldn't have been! -- but there's a strong psychological expectation for it to be there.

With images, it's a bit easier to put the high frequencies back in via judicious use of edge enhancement, perhaps because you have two dimensions to work with rather than one dimension in the audio case.