This is interesting. This is an example of a piece which ages poorly because of changing instruments. The piano that Mozart wrote this for had much shorter sustain (hence why pre-19th century pieces feature a flood of staccato notes with fewer long, sustained notes and chords), and piano action was inferior. Additionally, note strength/volume got weaker as you moved up the register. Which was also only 5 octaves instead of the modern 8, which is why these older pieces seem to ignore a good chunk of the modern piano; those chunks didn't exist.
What really stands out in this song, though, are the random high notes in the one arrangement that are really jarring. They jump out too much. But on an 18th century piano, they would have been a lot quieter.
There. Now I've forced you swine to learn something.