This is an interesting example and thanks for sharing it. IMO I think both you and your management had a point and working together you did/could have achieved the same goal.
Your management were seeking a culture of improvement that was ingrained. You too probably wanted this aim, but recognised that this would not be achieved without actions that nurture this culture. The 8th step helped nurture and sustain.
I would argue that with time and other activities that nurture this culture, that the 8th step would become redundant anyway, perhaps, talking about ultimate ideals, the
8D process need never be instigated, as you have reached the utopia that is 100% satisfaction, with no issues!!!