The Finance department never bought into it. They needed to provide funding to product owner initiatives that aligned with the business and then just let go of the process. C-suite and finance people will never do that.
Delivering sooner, not faster.
To do this, decision makers must be close to the team, and ideally a part of the team. Either managers are part of the team, or the team a given the authority to make product decisions.
Full time managers lose power and influence either way, and I think this is the real reason Big Corp never really bought into it except on paper.