My feeling is that even the most politely and helpfully stated suggestion to cancel the meeting would be treated as insubordination, especially if it became a habit. Which it would need to.
I don’t think that having things go wrong necessarily means that you aren’t following the methodology correctly. I’m nowhere near convinced that this stuff is any good. What little I’ve done of it always had a “going through the motions” feel to it. What do we do next? Let me look it up. I think that in a few years a lot of people will look back and realized they wasted a lot of time.