Is it good that I can play the song Humoresque by antonin dvorak on the piano

in all sharps or flats? In other words, I can literally change the key of the song. For example, if it says to play c, d, e, f #, g, a ,b, and c, I can play b, d flat, e flat, f, g flat or f sharp, a flat, b flat, and of course b. Isn't this a great talent I have that I can change keys in a song?
 
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