[laser]

Why is it not entering the realm of possibility for the migration system to function not at an API layer but at the levels of pixels and OCR and RPA to click through every possible interface within the ERP to export and structure the legacy data to complete a total migration? Like humans copying over the data manually?

[hef19898]

Because the migration has to be auditable. And the data fields between the systems / databases mapped against business processes, on both systems. If you find a solution to automate that, cudos...

[arach]

would it be fair to suggest an automated migration solution (therefore less manual) might be more auditable than human driven?

You'd probably start with a human in the loop solution but mapping should be a solvable problem