IMO, it depends on the listener and how blinkered the listener is to different musics.
Some people ONLY listen to old skool 88-92 - they are missing out on LOADS of music.
Some people ONLY listen to breakbeat tunes - they are missing out on LOADS of music.
Some people ONLY listen to piano tunes - they are missing out on LOADS of music.
Some people ONLY listen to acid house tunes - they are missing out on LOADS of music.
Some people ONLY listen to Dance music as a whole - they are missing out on LOADS of music.
If you listen to ANYTHING as there's always SOMETHING good from each style of music that will appeal to you then you've more chance of a great catchment of good music.
As for the question, if we all liked the same music, yes it'd be boring as we'd have TOO much in common and nothing to discuss, also we'd not be able to wind each other up and have sly digs about piano/acid
You need to be more like John Peel, play/listen to all sorts of stuff
