Silent rounds can be unsettling - and not cos you don't know how you did, cos goo.gl/HMpi17 exists. You miss having the arguments you gave given back, tied up with string - tied up with what everyone else said. It kinda feels like you're just saying words, just talking - in fact adjudications are the only substantive, non-ritual things that separate debating from talking. They contain the promise of debating: that when people argue they really are all thinking and talking about the same thing, really communicating, really living in the same world. "Engagement" is a little, hypothetical, bridge over solipsism
Hypothetical being the operative word: all systems of communication are reductive, though you forget that because, within a system, it is useful to forget. Silent rounds prepare your departure, they push you out of the cage you've come to love (as they say). That way, when the break's announced, hopefully you don't care - you've remembered the vast swathes of yourself that neither debating nor anything else can see.
Then, if you break (as ANU A and Vincent did! aww yes!), you get back in the cage and it all starts again!!