Typically, discount brokers provide advanced electronic trading platforms which may be appealing to frequent and active traders but may deter some novice investors.
This is an appealing, and ultimately moving, ensemble comedy/drama about ordinary folks whose one chance at anything resembling stardom is a karaoke contest...
Now, its just an intentional throwback, wrapping everything in intentional artifice to preserve something that was appealing for being primitive and not particularly thought-out.