So - I have a simple PCR0 auto-loader in my bootstrap.php, that should load any PCR0 compatible library class from vendors directory... 

spl_autoload_register( function( $classname ) {
    $path = preg_match( '/\\\\/', $classname )
    ? str_replace( '\\', DIRECTORY_SEPARATOR, $classname )
    : str_replace( '_', DIRECTORY_SEPARATOR, $classname );
    $file = VENDORS_PATH . DIRECTORY_SEPARATOR  . $path . '.php';
    if ( file_exists( $file ) ) {
        require_once( $file );
    }
});

I'm not sure if I understand why composer generates auto-loading files in vendors directory (namely composer directory and autoload.php file) ?

Can I stop Composer from generating those auto-loader files? or am I missing something? I don't think I need them?

php composer-php
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