tubby, yes WHY … and yes, and yes, all of the above.
The difficulty is in identifying the dominant parameters; reduced heating, power consumption, etc, vs different airflow patterns around new designs.
I would start with the technical aspects, check the changes and the assumptions made about change … ‘there will be little or no effect’, then check why the designers thought that way, what assumptionswere made in the design and operation … why.
Previous types did not have/use AOA, its only now that we rely on it that the failures are noticed.