It's not so much a waste of time as creating a better record (video, sound bytes, things that can be plugged into commercials and referred to by candidates with memorable reference) for the 2020 campaign. He unequivocally said he did not exonerate the President, that Trump could be indicted after leaving office, that the Russian threat is ongoing and dire, among many other things. We're in the spin zone, so it all seems a bit partisan and therefore meaningless but there was real news today. Schiff's questioning of Mueller was expert, in and of itself creates a startling record of the seriousness of what happened during 2016. All that said, in the current news cycle, as you say for those who pay attention, our biases will only be confirmed. I think this is better fodder for the Democratic candidates than Trump himself.