To be honest, all you have control over a piano key is the velocity at it which the hammer strikes the strings, that's pretty much it.
If you bang it hard, then you get it loud, if you bang it soft, you get it soft. That's pretty much control over tone we get in piano, unlike stringed instruments. However, that doesn't mean we should give up the pursuit for tone control. Most of the 'colorful' playing comes from experience and personal interpretation of the piece.
If you bang the key, it will just be blaring and loud. Now, if you do that in some other pieces (like some banging piece in Bartok), then it wouldn't matter, but if you do it in a very lyrical piece, let's say a Mozart Sonata, then of course, it would be ugly.