re Windmilling -
Interesting, how is that regulated?
Two aspects:
Safety - even if a windmilling engine should seize, the loads should be negligible compared to an operating engine, for which certification criteria have been demonstrated.
Resulting damage (economic loss) from windmilling - that's a matter between the motormaker and the airline. As long as the crew follows the recommendations, it's up to the engine manufacturer to make good any adversely-affected hardware.