Just as every generation believes it invented sex, mind altering experiences, and timeless music, to presume that the modern gaming controller is somehow revolutionary in the world of music is just juvenile.
Musical instruments have an enormous range of shapes and sizes, and since the advent of the vacuum tube and transistor, the shapes have become almost unlimited.
The reality of the situation though is that humans have to play them and more importantly, other humans have to want to listen to their product for them to be successful.
Probably the most advanced instruments today look a hell of a lot like a PC or Macintosh and may or not be attached to something resembling a classic instrument like a piano, drum set, etc... Some just have a normal PC keyboard and make amazing sound.
A modern gaming controller has what, 2 2 axis thumb sticks and maybe a dozen buttons, BFD! Even a 1/2 decent "keyboard" has at least 4 or 5 octaves worth of pressure sensitive, rate sensitive, etc. keys that can produce a practically infinite range of sounds. Heck, people have used stringed instruments hooked to electronics to produce an insane array of results. How much more complicated yet humanly interactive is a 5 or 6 stringed instrument with basically infinite variability on each string.
The guy needs to get over himself and realize he doesn't know WTF he is talking about.
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I am a Commodore PET --- Now get off my lawn you kids... 
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