I am pretty much interested in how fellow pianists think about life, love, the world, religion, politics, everything. You can't replace that with just chatting in a random forum with other, non pianist people. If you live music and make music to live your view of everything is different from other persons who don't make music and don't share this part of life. So I would badly miss the anything board. 
I'm not sure .... it's clear enough that playing the piano and loving music doesn't uniformely change or shape our view about life, love, religion and so on
We're so different in our views that I can't see the difference between discussing these topics with a pianist or discussing them with a person that doesn't know music or play an instrument. It has always been like this. Think for example of the difference between Wagner, Brahms and Tchaikovsky ... all composers, all musically aware, yet the "common points" end here. Except for their knowledge and love of music they were so different about anything else from the other that a complete stranger from the street would have had more things in commin with them than what they had in common with each other ...
I understand that from a certain point of view experiencing music should shape our views in a similar manner (likewise I don't expect to find many republican in a zealous pro-environment and animal-rights forum)
But music and playing are so abstract as concepts in nature that there are so many different interpretations which are consistent with our different view of life
For example one could think of music a strong manifenstation of control and order hence being consistence the freak-control mentality, one could think of music as the absolete chance combination of sound hence being consistent with a cynical hyper-pragmatic mentality, one could think of music as the attempt by human to emulate the natural sound hence (harmonical sounds = beautiful natural sound, unhamornical sounds = danger sounds (volcano, heartquacke, screams) hence being consistent with an hyper-environmental mentality, one could think of music as the language of god and musicians as his translator hence being consistent with a strong religious mentality, one could think of music as one of the only still intact root with the past hence being consistent with a conservative mentality, one could think of music as the only mean that allows so much evolution hence being consistent with progressive mentality, one could think of music as a manifenstation of the absolute freedom of the individual hence being consistent with liber and pseudo-anarchical theories, one could think of music as an hidden maninfestation of energy hence being consistent with hermetic and meta-physical theories .... and so on and on and on
See what I mean ?