White House Chief of Staff Mark Meadows witnessed Trump's sedition first hand. While it would be nice to have his truthful testimony, we can get along without it. There were other people in the room too, and they are talking to the Select Committee. And then there are the documents and texts Meadows did release.
We live in "interesting" times. Stressful but interesting.
Not half as stressful as it will be if Trump and his co-conspirators are not held accountable for their attempted coup. If they skate, then J6 was just a dress rehearsal, and they will try again, and possibly succeed next time.