This is a story about a cabin crew who did speak out. They initially assumed the expert halo. The pilot must have checked. But then eventually spoke up.
It is really common in accident reports that people were worried but did not speak up.
So when off piste if you are worried then speak up
https://www.independent.co.uk/travel/news-and-advice/plane-ice-snow-wings-flight-danger-cabin-crew-civil-aviation-authority-a9245106.html