Starlink requires new antenna / hardware to be fitted to the aircraft.

This approach doesn't require aircraft changes (and revalidation) - aircraft use the same radios. The satellites provide a relay.

Starlink has shut down service suddenly, surprising the customer. That's a big no for the extremely safety-minded aviation regulators. A BIG no.

Yes but Elon did some stuff Europeans don't like, so they don't want to use Starlink.