Pianists don't argue too much generally because we have such a hard time just getting things right; arguing is for string players.
The stage is close to being in the middle of the hall, so that the performers are surrounded by the listeners. I feel that we are all experiencing the music together.
I have always thought that my ear is also very influenced by my eyes.
I usually only play with very close friends.
A lot of it just has to do with luck, serendipity.