The question about team structure is not how much structure does the team have? All teams need structural supports. The question is what kind of structure? Does is it enable cooperative work, or does it make team work more difficult and frustrating.
With high change we know less about what to do, how to do it, the path to take or not to take, and who should or should not have the authority to complete team tasks.
The notion that a team can define accountability & authority means that they know the outcome before it happens & have removed all ambiguity, judgment, innovation & human interaction from the work. That to me sounds like a robot path to disengagement.