This cuts out the loyalty/status incentive to conform.
Instead, the trust is tasked solely with offering creative input and advice.
Nobody pulls any punches to be polite.
This works because all the participants have come to trust and respect one another.
They know it's far better to learn about problems from colleagues when there's still time to fix them than from the audience after it's too late.

What-Are-Pain-Eradication-Systems-And-Why-Is-This-Matter-Significant-Now-.pdf