They are all waiting precisely because it removes any narrative from Trump about bias. It also plays out in slow motion just how well the process of counting votes actually works. All these officials from the states coming out and speaking to exactly how they count votes, what votes remain to be counted, why they remain to be counted, how they report outcomes, how they address complaints, etc. It's actually a public service to our democracy IMO for them NOT to call this and to wait while they drive home all these examples of how good the process actually is. They're just slowing letting all the air leak from the Trump balloon.