Well, suppose the turnchat is at 6:00am EDT, and the TCIT wasn't posted until 8 hours before (at 10:00pm EDT). For those of us on the east coast, we might be going to bed then to get up for work or school the next morning. We're not robots that sit at the computer pressing refresh every 10 seconds (I think I've said that enough this game). Not posting a turnchat early can lead to missed instructions.
I remember back in DG1 when Disorganizer wanted to PI me because I didn't put a turnchat thread up 8 hours after elections ended (by which I was still sleeping!).